MOT Risk Index.co.uk

Mercedes-Benz B-Class MOT pass rate and common problems

77.0% of Mercedes-Benz B-Class models passed the 2024 MOT (71,436 first tests): 72.4% at the first attempt and 4.6% after a fix at the test centre (PRS). About 3 in 10 failed the first attempt. For its age, it fails 8% less often than normal: MOT Risk Index 91.8 (95% CI 90.7–92.9; 100 = normal).

Mercedes-Benz B-Class at a glance, 2024 MOT
MeasureValueUnitCompared withYearsTests
MOT pass rate77.0%incl. 4.6% fixed at the test centre202471436
Passed at the first attempt72.4%all first tests202471436
MOT Risk Index (95% CI 90.7–92.9)91.8index100 = normal for its age · rank 365 (tied) of 761 (1 = fails least for its age)202471436
Biggest excess: Body, chassis, structure6.2per 1004.5 same-age2019–2024391293
Dangerous defects9.4per 10011.2 UK, not age-adjusted2019–2024391293
Advisory items103.0per 100127.1 UK, not age-adjusted2019–2024391293
strip · Mercedes-Benz B-Class · MOT Risk Index · 91.8 vs 100 = normal · 2024
MOT Risk Index · Mercedes-Benz B-Class. 0–240; 100 = normal for its age; median model 92.8 · rank 365 (tied) of 761 (1 = fails least for its age). It would rank between 357 and 383 anywhere within its 95% interval, other models held where they are. DVSA, 2024.
Mercedes-Benz B-Class index position among 761 models
MeasureValueUnitCompared withYearsTests
Rank365of 761published models, 1 = fails least for its age202471436
Best rank within its 95% interval357rankother models held where they are202471436
Worst rank within its 95% interval383rankother models held where they are202471436

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Download this page's numbers (CSV) · How to cite

Data release dvsa-2024-v2 (24 Sep 2026) · full dataset (v5). This model's index changed from 92.8 to 91.8 in the 24 September 2026 release, after duplicate test records were removed.

What actually fails on a Mercedes-Benz B-Class MOT, and how often?

Mercedes-Benz B-Class MOTs fail most often on ‘lamps, reflectors and electrical equipment’: 12.5 per 100 tests, against 15.7 for UK cars of the same age (2019–2024, n = 391,293).

bar · Mercedes-Benz B-Class · Lamps, reflectors and electrical equipment · 12.5 vs 15.7 · 2019–2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Lamps, reflectors and electrical equipment12.5per 10015.72019–202448941
Suspension12.4per 10014.02019–202448364
Brakes9.8per 10010.52019–202438178
Tyres8.6per 1009.02019–202433463
Visibility6.5per 1007.52019–202425376
Body, chassis, structure6.2per 1004.52019–202424130

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 391,293 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Tyres, brakes and suspension: how does the Mercedes-Benz B-Class compare with cars of the same age?

The biggest excess for the Mercedes-Benz B-Class is tyres at age 6: 6.4 failures per 100 tests, against 5.5 for same-age cars of comparable models (2019–2024, n = 32,682).

bullet · Mercedes-Benz B-Class · Tyres, age 3 · 4.8 vs 4.2 · 2019–2024
Tyres, age 3: 4.8 vs 4.2. Brakes, age 3: 0.8 vs 1.8. Suspension, age 3: 0.1 vs 0.6. Tyres, age 4: 5.0 vs 4.5. Brakes, age 4: 1.0 vs 2.4. Suspension, age 4: 0.3 vs 1.2. Tyres, age 5: 5.7 vs 5.1. Brakes, age 5: 1.4 vs 3.1. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Tyres, age 34.8per 1004.22019–202425217
Brakes, age 30.8per 1001.82019–202425217
Suspension, age 30.1per 1000.62019–202425217
Tyres, age 45.0per 1004.52019–202427730
Brakes, age 41.0per 1002.42019–202427730
Suspension, age 40.3per 1001.22019–202427730
Tyres, age 55.7per 1005.12019–202431499
Brakes, age 51.4per 1003.12019–202431499
Full table
Further values · 2019–2024
MeasureValueUnitCompared withYearsTests
Suspension, age 50.8per 1002.22019–202431499
Tyres, age 66.4per 1005.52019–202432682
Brakes, age 61.8per 1003.82019–202432682
Suspension, age 61.9per 1003.72019–202432682
Tyres, age 76.5per 1006.02019–202435555
Brakes, age 72.2per 1004.52019–202435555
Suspension, age 73.6per 1005.72019–202435555
Tyres, age 86.5per 1006.32019–202435115
Brakes, age 83.1per 1005.42019–202435115
Suspension, age 85.9per 1007.82019–202435115

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Will my Mercedes-Benz B-Class's advisory become a fail at the next MOT?

Mercedes-Benz B-Class advisories turn into fails less often than on the median model; the one to watch is suspension: advisories on it became a fail at the next MOT 22.2% of the time.

funnel · Mercedes-Benz B-Class · Suspension · 22.2 vs median model · 2019–2024
Advisories on suspension: 22.2 of 100 became a fail on the same item at the next MOT. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Suspension22.2% next failmedian model2019–202417755
Lamps, reflectors and electrical equipment22.0% next failmedian model2019–20244888
Body, chassis, structure21.8% next failmedian model2019–20243138
Brakes12.6% next failmedian model2019–202461033
Tyres8.8% next failmedian model2019–202472210
Noise, emissions and leaks5.6% next failmedian model2019–20242985
Seat belts and supplementary restraint systems4.1% next failmedian model2019–20241509
Identification of the vehicle3.2% next failmedian model2019–20244702
Full table
Further values · 2019–2024
MeasureValueUnitCompared withYearsTests
Steering3.1% next failmedian model2019–20241698
Road wheels2.0% next failmedian model2019–20243626
Non-component advisories0% next failmedian model2019–202424339

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

My Mercedes-Benz B-Class got an MOT advisory: what gets flagged most?

Mercedes-Benz B-Class MOTs flag tyres most: 38.9 advisories per 100 tests, against 39.7 across UK tests (2019–2024, n = 391,293).

bar · Mercedes-Benz B-Class · Tyres · 38.9 vs 39.7 · 2019–2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Tyres38.9per 10039.72019–2024152377
Brakes36.5per 10034.72019–2024142690
Suspension9.2per 10026.22019–202436109
Non-component advisories9.2per 1007.82019–202436035
Lamps, reflectors and electrical equipment2.1per 1002.82019–20248236
Identification of the vehicle1.9per 1002.52019–20247356

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 391,293 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

What is likely to fail next on a Mercedes-Benz B-Class?

For Mercedes-Benz B-Class models aged 3 to 5 whose last MOT was a pass, the item most likely to fail at the next MOT is tyres: 4.7% failed on it (2019–2024, n = 46,820).

bar · Mercedes-Benz B-Class · Tyres, under 3 years old, after a pass · 4.9 vs baseline · 2019–2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Tyres, under 3 years old, after a pass4.9% next fail2019–202413295
Visibility, under 3 years old, after a pass2.9% next fail2019–202413295
Lamps, reflectors and electrical equipment, under 3 years old, after a pass2.3% next fail2019–202413295
Brakes, under 3 years old, after a pass0.9% next fail2019–202413295
Seat belts and supplementary restraint systems, under 3 years old, after a pass0.3% next fail2019–202413295
Noise, emissions and leaks, under 3 years old, after a pass0.3% next fail2019–202413295
Suspension, under 3 years old, after a pass0.3% next fail2019–202413295
Road wheels, under 3 years old, after a pass0.3% next fail2019–202413295
Full table
Further values · 2019–2024
MeasureValueUnitCompared withYearsTests
Body, chassis, structure, under 3 years old, after a pass0.2% next fail2019–202413295
Identification of the vehicle, under 3 years old, after a pass0.1% next fail2019–202413295
Tyres, under 3 years old, after an advisory5.2% next fail2019–20243222
Visibility, under 3 years old, after an advisory4% next fail2019–20243222
Lamps, reflectors and electrical equipment, under 3 years old, after an advisory2.6% next fail2019–20243222
Brakes, under 3 years old, after an advisory1.7% next fail2019–20243222
Noise, emissions and leaks, under 3 years old, after an advisory0.5% next fail2019–20243222
Seat belts and supplementary restraint systems, under 3 years old, after an advisory0.4% next fail2019–20243222
Suspension, under 3 years old, after an advisory0.4% next fail2019–20243222
Body, chassis, structure, under 3 years old, after an advisory0.3% next fail2019–20243222
Road wheels, under 3 years old, after an advisory0.2% next fail2019–20243222
Tyres, under 3 years old, after a fail5.3% next fail2019–20241765
Lamps, reflectors and electrical equipment, under 3 years old, after a fail4.3% next fail2019–20241765
Visibility, under 3 years old, after a fail4.2% next fail2019–20241765
Brakes, under 3 years old, after a fail1.1% next fail2019–20241765
Seat belts and supplementary restraint systems, under 3 years old, after a fail0.7% next fail2019–20241765
Noise, emissions and leaks, under 3 years old, after a fail0.4% next fail2019–20241765
Suspension, under 3 years old, after a fail0.4% next fail2019–20241765
Identification of the vehicle, under 3 years old, after a fail0.3% next fail2019–20241765
Tyres, 3 to 5 years old, after a pass4.7% next fail2019–202446820
Lamps, reflectors and electrical equipment, 3 to 5 years old, after a pass3.7% next fail2019–202446820
Visibility, 3 to 5 years old, after a pass2.9% next fail2019–202446820
Suspension, 3 to 5 years old, after a pass1.4% next fail2019–202446820
Brakes, 3 to 5 years old, after a pass1.2% next fail2019–202446820
Noise, emissions and leaks, 3 to 5 years old, after a pass0.6% next fail2019–202446820
Seat belts and supplementary restraint systems, 3 to 5 years old, after a pass0.4% next fail2019–202446820
Road wheels, 3 to 5 years old, after a pass0.2% next fail2019–202446820
Body, chassis, structure, 3 to 5 years old, after a pass0.2% next fail2019–202446820
Identification of the vehicle, 3 to 5 years old, after a pass0.1% next fail2019–202446820
Steering, 3 to 5 years old, after a pass0.0% next fail2019–202446820
Tyres, 3 to 5 years old, after an advisory7.3% next fail2019–202418221
Lamps, reflectors and electrical equipment, 3 to 5 years old, after an advisory4.5% next fail2019–202418221
Visibility, 3 to 5 years old, after an advisory4.0% next fail2019–202418221
Suspension, 3 to 5 years old, after an advisory2.1% next fail2019–202418221
Brakes, 3 to 5 years old, after an advisory2.0% next fail2019–202418221
Noise, emissions and leaks, 3 to 5 years old, after an advisory0.8% next fail2019–202418221
Seat belts and supplementary restraint systems, 3 to 5 years old, after an advisory0.6% next fail2019–202418221
Road wheels, 3 to 5 years old, after an advisory0.4% next fail2019–202418221
Body, chassis, structure, 3 to 5 years old, after an advisory0.2% next fail2019–202418221
Identification of the vehicle, 3 to 5 years old, after an advisory0.2% next fail2019–202418221
Steering, 3 to 5 years old, after an advisory0.1% next fail2019–202418221
Tyres, 3 to 5 years old, after a fail7.8% next fail2019–20249853
Lamps, reflectors and electrical equipment, 3 to 5 years old, after a fail6.5% next fail2019–20249853
Visibility, 3 to 5 years old, after a fail4.9% next fail2019–20249853
Brakes, 3 to 5 years old, after a fail2.4% next fail2019–20249853
Suspension, 3 to 5 years old, after a fail2.4% next fail2019–20249853
Noise, emissions and leaks, 3 to 5 years old, after a fail1.8% next fail2019–20249853
Seat belts and supplementary restraint systems, 3 to 5 years old, after a fail1.1% next fail2019–20249853
Road wheels, 3 to 5 years old, after a fail0.5% next fail2019–20249853
Body, chassis, structure, 3 to 5 years old, after a fail0.3% next fail2019–20249853
Identification of the vehicle, 3 to 5 years old, after a fail0.1% next fail2019–20249853
Steering, 3 to 5 years old, after a fail0.1% next fail2019–20249853
Suspension, 6 to 8 years old, after a pass6.1% next fail2019–202444918
Lamps, reflectors and electrical equipment, 6 to 8 years old, after a pass5.7% next fail2019–202444918
Tyres, 6 to 8 years old, after a pass5.4% next fail2019–202444918
Visibility, 6 to 8 years old, after a pass3.4% next fail2019–202444918
Brakes, 6 to 8 years old, after a pass2.3% next fail2019–202444918
Noise, emissions and leaks, 6 to 8 years old, after a pass1.3% next fail2019–202444918
Seat belts and supplementary restraint systems, 6 to 8 years old, after a pass0.9% next fail2019–202444918
Body, chassis, structure, 6 to 8 years old, after a pass0.8% next fail2019–202444918
Road wheels, 6 to 8 years old, after a pass0.5% next fail2019–202444918
Identification of the vehicle, 6 to 8 years old, after a pass0.2% next fail2019–202444918
Steering, 6 to 8 years old, after a pass0.1% next fail2019–202444918
Suspension, 6 to 8 years old, after an advisory8.3% next fail2019–202424055
Tyres, 6 to 8 years old, after an advisory7.8% next fail2019–202424055
Lamps, reflectors and electrical equipment, 6 to 8 years old, after an advisory7.4% next fail2019–202424055
Visibility, 6 to 8 years old, after an advisory5.0% next fail2019–202424055
Brakes, 6 to 8 years old, after an advisory4.3% next fail2019–202424055
Noise, emissions and leaks, 6 to 8 years old, after an advisory1.8% next fail2019–202424055
Seat belts and supplementary restraint systems, 6 to 8 years old, after an advisory1.2% next fail2019–202424055
Body, chassis, structure, 6 to 8 years old, after an advisory0.9% next fail2019–202424055
Road wheels, 6 to 8 years old, after an advisory0.8% next fail2019–202424055
Identification of the vehicle, 6 to 8 years old, after an advisory0.2% next fail2019–202424055
Steering, 6 to 8 years old, after an advisory0.2% next fail2019–202424055
Lamps, reflectors and electrical equipment, 6 to 8 years old, after a fail10.4% next fail2019–202418451
Suspension, 6 to 8 years old, after a fail9.3% next fail2019–202418451
Tyres, 6 to 8 years old, after a fail8.7% next fail2019–202418451
Visibility, 6 to 8 years old, after a fail6.2% next fail2019–202418451
Brakes, 6 to 8 years old, after a fail5.2% next fail2019–202418451
Noise, emissions and leaks, 6 to 8 years old, after a fail3.3% next fail2019–202418451
Seat belts and supplementary restraint systems, 6 to 8 years old, after a fail2.2% next fail2019–202418451
Body, chassis, structure, 6 to 8 years old, after a fail1.6% next fail2019–202418451
Road wheels, 6 to 8 years old, after a fail1.2% next fail2019–202418451
Identification of the vehicle, 6 to 8 years old, after a fail0.4% next fail2019–202418451
Steering, 6 to 8 years old, after a fail0.3% next fail2019–202418451
Suspension, 9 to 11 years old, after a pass11.4% next fail2019–202427914
Lamps, reflectors and electrical equipment, 9 to 11 years old, after a pass9.0% next fail2019–202427914
Brakes, 9 to 11 years old, after a pass5.6% next fail2019–202427914
Tyres, 9 to 11 years old, after a pass5.2% next fail2019–202427914
Visibility, 9 to 11 years old, after a pass4.6% next fail2019–202427914
Body, chassis, structure, 9 to 11 years old, after a pass4.2% next fail2019–202427914
Noise, emissions and leaks, 9 to 11 years old, after a pass2.0% next fail2019–202427914
Seat belts and supplementary restraint systems, 9 to 11 years old, after a pass0.9% next fail2019–202427914
Road wheels, 9 to 11 years old, after a pass0.7% next fail2019–202427914
Steering, 9 to 11 years old, after a pass0.4% next fail2019–202427914
Identification of the vehicle, 9 to 11 years old, after a pass0.2% next fail2019–202427914
Suspension, 9 to 11 years old, after an advisory16.1% next fail2019–202420250
Lamps, reflectors and electrical equipment, 9 to 11 years old, after an advisory12.2% next fail2019–202420250
Brakes, 9 to 11 years old, after an advisory9% next fail2019–202420250
Tyres, 9 to 11 years old, after an advisory7.4% next fail2019–202420250
Visibility, 9 to 11 years old, after an advisory7.0% next fail2019–202420250
Body, chassis, structure, 9 to 11 years old, after an advisory5.9% next fail2019–202420250
Noise, emissions and leaks, 9 to 11 years old, after an advisory2.6% next fail2019–202420250
Seat belts and supplementary restraint systems, 9 to 11 years old, after an advisory1.3% next fail2019–202420250
Road wheels, 9 to 11 years old, after an advisory0.7% next fail2019–202420250
Steering, 9 to 11 years old, after an advisory0.5% next fail2019–202420250
Identification of the vehicle, 9 to 11 years old, after an advisory0.3% next fail2019–202420250
Suspension, 9 to 11 years old, after a fail18.3% next fail2019–202422590
Lamps, reflectors and electrical equipment, 9 to 11 years old, after a fail16.0% next fail2019–202422590
Brakes, 9 to 11 years old, after a fail11.4% next fail2019–202422590
Tyres, 9 to 11 years old, after a fail9.0% next fail2019–202422590
Visibility, 9 to 11 years old, after a fail8.6% next fail2019–202422590
Body, chassis, structure, 9 to 11 years old, after a fail8.3% next fail2019–202422590
Noise, emissions and leaks, 9 to 11 years old, after a fail5.0% next fail2019–202422590
Seat belts and supplementary restraint systems, 9 to 11 years old, after a fail2.0% next fail2019–202422590
Road wheels, 9 to 11 years old, after a fail1.1% next fail2019–202422590
Steering, 9 to 11 years old, after a fail0.8% next fail2019–202422590
Identification of the vehicle, 9 to 11 years old, after a fail0.4% next fail2019–202422590
Suspension, 12 to 14 years old, after a pass14.4% next fail2019–202413932
Body, chassis, structure, 12 to 14 years old, after a pass13.0% next fail2019–202413932
Lamps, reflectors and electrical equipment, 12 to 14 years old, after a pass11.8% next fail2019–202413932
Brakes, 12 to 14 years old, after a pass9.0% next fail2019–202413932
Visibility, 12 to 14 years old, after a pass6.9% next fail2019–202413932
Tyres, 12 to 14 years old, after a pass4.7% next fail2019–202413932
Noise, emissions and leaks, 12 to 14 years old, after a pass2.9% next fail2019–202413932
Seat belts and supplementary restraint systems, 12 to 14 years old, after a pass1.1% next fail2019–202413932
Steering, 12 to 14 years old, after a pass0.8% next fail2019–202413932
Road wheels, 12 to 14 years old, after a pass0.5% next fail2019–202413932
Identification of the vehicle, 12 to 14 years old, after a pass0.2% next fail2019–202413932
Suspension, 12 to 14 years old, after an advisory19.9% next fail2019–202414791
Body, chassis, structure, 12 to 14 years old, after an advisory16.4% next fail2019–202414791
Lamps, reflectors and electrical equipment, 12 to 14 years old, after an advisory15.5% next fail2019–202414791
Brakes, 12 to 14 years old, after an advisory13.5% next fail2019–202414791
Visibility, 12 to 14 years old, after an advisory9.8% next fail2019–202414791
Tyres, 12 to 14 years old, after an advisory6.7% next fail2019–202414791
Noise, emissions and leaks, 12 to 14 years old, after an advisory3.7% next fail2019–202414791
Seat belts and supplementary restraint systems, 12 to 14 years old, after an advisory1.7% next fail2019–202414791
Steering, 12 to 14 years old, after an advisory1.1% next fail2019–202414791
Road wheels, 12 to 14 years old, after an advisory0.6% next fail2019–202414791
Identification of the vehicle, 12 to 14 years old, after an advisory0.4% next fail2019–202414791
Suspension, 12 to 14 years old, after a fail21.7% next fail2019–202419717
Body, chassis, structure, 12 to 14 years old, after a fail19.1% next fail2019–202419717
Lamps, reflectors and electrical equipment, 12 to 14 years old, after a fail18.9% next fail2019–202419717
Brakes, 12 to 14 years old, after a fail16.6% next fail2019–202419717
Visibility, 12 to 14 years old, after a fail12.1% next fail2019–202419717
Tyres, 12 to 14 years old, after a fail7.6% next fail2019–202419717
Noise, emissions and leaks, 12 to 14 years old, after a fail6.2% next fail2019–202419717
Seat belts and supplementary restraint systems, 12 to 14 years old, after a fail2.1% next fail2019–202419717
Steering, 12 to 14 years old, after a fail1.5% next fail2019–202419717
Road wheels, 12 to 14 years old, after a fail0.8% next fail2019–202419717
Identification of the vehicle, 12 to 14 years old, after a fail0.4% next fail2019–202419717
Body, chassis, structure, 15 to 19 years old, after a pass17.3% next fail2019–20243408
Suspension, 15 to 19 years old, after a pass12.8% next fail2019–20243408
Lamps, reflectors and electrical equipment, 15 to 19 years old, after a pass11.9% next fail2019–20243408
Brakes, 15 to 19 years old, after a pass9.2% next fail2019–20243408
Visibility, 15 to 19 years old, after a pass8.8% next fail2019–20243408
Tyres, 15 to 19 years old, after a pass4.6% next fail2019–20243408
Noise, emissions and leaks, 15 to 19 years old, after a pass3.4% next fail2019–20243408
Seat belts and supplementary restraint systems, 15 to 19 years old, after a pass1.5% next fail2019–20243408
Steering, 15 to 19 years old, after a pass1.4% next fail2019–20243408
Road wheels, 15 to 19 years old, after a pass0.7% next fail2019–20243408
Identification of the vehicle, 15 to 19 years old, after a pass0.4% next fail2019–20243408
Body, chassis, structure, 15 to 19 years old, after an advisory22.9% next fail2019–20244312
Suspension, 15 to 19 years old, after an advisory17.4% next fail2019–20244312
Lamps, reflectors and electrical equipment, 15 to 19 years old, after an advisory16.3% next fail2019–20244312
Brakes, 15 to 19 years old, after an advisory14.3% next fail2019–20244312
Visibility, 15 to 19 years old, after an advisory11.4% next fail2019–20244312
Tyres, 15 to 19 years old, after an advisory6.6% next fail2019–20244312
Noise, emissions and leaks, 15 to 19 years old, after an advisory4.2% next fail2019–20244312
Steering, 15 to 19 years old, after an advisory2.0% next fail2019–20244312
Seat belts and supplementary restraint systems, 15 to 19 years old, after an advisory1.8% next fail2019–20244312
Road wheels, 15 to 19 years old, after an advisory1% next fail2019–20244312
Identification of the vehicle, 15 to 19 years old, after an advisory0.6% next fail2019–20244312
Body, chassis, structure, 15 to 19 years old, after a fail25.1% next fail2019–20246071
Lamps, reflectors and electrical equipment, 15 to 19 years old, after a fail20.2% next fail2019–20246071
Suspension, 15 to 19 years old, after a fail19.5% next fail2019–20246071
Brakes, 15 to 19 years old, after a fail17.7% next fail2019–20246071
Visibility, 15 to 19 years old, after a fail15.1% next fail2019–20246071
Tyres, 15 to 19 years old, after a fail7.8% next fail2019–20246071
Noise, emissions and leaks, 15 to 19 years old, after a fail6.7% next fail2019–20246071
Seat belts and supplementary restraint systems, 15 to 19 years old, after a fail3.0% next fail2019–20246071
Steering, 15 to 19 years old, after a fail2.3% next fail2019–20246071
Road wheels, 15 to 19 years old, after a fail1.1% next fail2019–20246071
Identification of the vehicle, 15 to 19 years old, after a fail0.4% next fail2019–20246071

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

How often does a Mercedes-Benz B-Class get a dangerous MOT defect?

The Mercedes-Benz B-Class gets a dangerous defect less often than the UK average: 9.4 per 100 first tests against 11.2 across the UK. In the same tests, 39.6 major and 12.1 minor defects were recorded per 100 tests (one test can record several).

bullet · Mercedes-Benz B-Class · Dangerous defects · 9.4 vs 11.2 · 2019–2024
Dangerous defects: 9.4 vs 11.2. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Dangerous defects9.4per 10011.22019–2024391293

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 391,293 (initial tests) · Method: one initial test per test_id; severity not recorded for some 2018–2021 tests · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Will my Mercedes-Benz B-Class still pass its MOT in a few years?

First-time MOT failures for the Mercedes-Benz B-Class go from 8.7% at age 3 to 43.6% at age 19 (rough estimate: 408 tests, 95% interval 38.9–48.5%), against 43.5% for all cars aged 19 (rough estimate: 408 tests, 95% interval 38.9–48.5%) (2024, n = 71,436).

line · Mercedes-Benz B-Class · Age 3 · 8.7 vs 12.4 · 2024
Age 3: 8.7. Age 19 (rough esti: 43.6. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Age 38.7% failed first time12.420241338
Age 49.0% failed first time13.120242806
Age 510.8% failed first time15.120244181
Age 614.0% failed first time17.520243982
Age 717.2% failed first time20.220245710
Age 819.5% failed first time23.320245368
Age 921.5% failed first time26.520245655
Age 1025.9% failed first time30.120248265
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Age 1128.5% failed first time33.220247124
Age 1229.7% failed first time35.720245798
Age 1341.1% failed first time38.220243571
Age 1441.9% failed first time40.420244569
Age 1543.6% failed first time41.620244315
Age 1645.6% failed first time43.120243495
Age 1744.7% failed first time43.120242684
Age 1844.2% failed first time43.920242042
Age 19 (rough estimate: 408 tests, 95% interval 38.9–48.5%)43.6% failed first time43.52024408

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

How does the Mercedes-Benz B-Class compare with cars of its own age and size?

At 7 of 17 ages shown, Mercedes-Benz B-Class models fail first time more often than comparable models of the same size class; the biggest difference is at age 4, where they fail less often: 11.3% against 13.3% (2024, n = 27,730).

line · Mercedes-Benz B-Class · Age 3 · 10.3 vs 11.7 · 2024
Age 3: 10.3. Age 19: 43.8. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Age 310.3% fail11.7202425217
Age 411.3% fail13.3202427730
Age 513.3% fail15.1202431499
Age 616.1% fail17.4202432682
Age 718.9% fail20.2202435555
Age 821.8% fail23.2202435115
Age 925.9% fail26.8202435078
Age 1029.0% fail30.0202433686
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Age 1133.0% fail33.5202429454
Age 1236.4% fail36.5202425878
Age 1340.5% fail38.9202423403
Age 1442.2% fail40.8202420520
Age 1543.5% fail42.3202415663
Age 1644.4% fail43.1202410313
Age 1744.0% fail43.520245789
Age 1844.1% fail43.620242578
Age 1943.8% fail43.22024409

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Which Mercedes-Benz B-Class years should I avoid?

The Mercedes-Benz B-Class build year that fails most for its age is 2011: index 116.6 (95% CI 114.0–119.2) against the model's own age norm of 100 (2019–2024, n = 21,943).

Build year matters for the Mercedes-Benz B-Class: 2011 Mercedes-Benz B-Class models fail more than their age would predict, 2019 ones less. Years whose confidence interval includes normal are shown without a label.

bar · Mercedes-Benz B-Class · Build year 2005 (rough estimate: 3,756 tests, 95% interval 94.4–104.0) · 99.2 vs 100 = normal · 2019–2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Build year 2005 (rough estimate: 3,756 tests, 95% interval 94.4–104.0)99.2index vs own age100 = normal2019–20243756
Build year 2006101.1index vs own age100 = normal2019–202416074
Build year 2007101.6index vs own age100 = normal2019–202418838
Build year 2008 (worse for its age)104.7index vs own age100 = normal2019–202422898
Build year 2009 (worse for its age)103.6index vs own age100 = normal2019–202427243
Build year 2010 (worse for its age)106.7index vs own age100 = normal2019–202428176
Build year 2011 (worse for its age)116.6index vs own age100 = normal2019–202421943
Build year 2012 (better for its age)95.3index vs own age100 = normal2019–202433753
Full table
Further values · 2019–2024
MeasureValueUnitCompared withYearsTests
Build year 2013 (better for its age)93.6index vs own age100 = normal2019–202439423
Build year 2014100.2index vs own age100 = normal2019–202446572
Build year 2015 (better for its age)94.5index vs own age100 = normal2019–202433910
Build year 201698.1index vs own age100 = normal2019–202432176
Build year 2017 (better for its age)96.9index vs own age100 = normal2019–202430281
Build year 2018100.4index vs own age100 = normal2019–202415953
Build year 2019 (better for its age)85.1index vs own age100 = normal2019–202412587
Build year 2020 (better for its age)86.7index vs own age100 = normal2019–20245645

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

How much does it cost to fix a Mercedes-Benz B-Class MOT fail?

Expected repair cost per Mercedes-Benz B-Class MOT: about £62 (up to about £118 if more expensive parts are needed), from the chance of failing each item and its most common UK repair price (catalogue estimate, n = 71,436).

Computed, not measured.

bar · Mercedes-Benz B-Class · Expected repair bill · 62.3 vs modal price catalogue · price catalogue
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (price catalogue)
MeasureValueUnitCompared withYearsTests
Expected repair bill62.3GBP estimatemodal price catalogueprice catalogue71436
Estimated range lower62.3GBP estimatemodal price catalogueprice catalogue71436
Estimated range upper118.3GBP estimatemodal price catalogueprice catalogue71436
Suspension: Suspension coil spring (single corner)22.3GBP expected contribution180price catalogue71436
Lamps, reflectors and electrical equipment: Battery replacement (standard 12V lead-acid)17.5GBP expected contribution140price catalogue71436
Brakes: Front brake pads (parts + labour, typical hatchback)14.7GBP expected contribution150price catalogue71436
Tyres: Tyre (single mid-range 16" fitted)7.7GBP expected contribution90price catalogue71436

Source: DVSA MOT bulk data · Window: price catalogue · n = 71,436 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Is the Mercedes-Benz B-Class more reliable than similar cars?

Of 8 similar models, 2 fail less often for their age than the Mercedes-Benz B-Class and 6 as often or more. The Mercedes-Benz B-Class has an MOT Risk Index of 91.8, where 100 = normal for its age (2024, n = 71,436).

bar · Mercedes-Benz B-Class · Mercedes-Benz B-Class (this model) · 91.8 vs 100 = normal · 2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Mercedes-Benz B-Class (this model)91.8index100 = normal202471436
Mercedes-Benz CLA100.6index91.8202463888
Toyota C-HR90.6index91.8202486481
Skoda Superb95.3index91.8202465281
Volkswagen Touran97index91.8202473577
Mitsubishi Outlander97index91.8202478306
Jaguar F-Pace86.7index91.8202454195
Land Rover Discovery Sport95.9index91.82024116148
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Volkswagen Passat92.4index91.82024190397

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

How many miles does a Mercedes-Benz B-Class normally do?

At age 8, the median Mercedes-Benz B-Class had covered 51,212 miles by its MOT; the middle half ranged from 36,697 to 68,653 miles (2024, n = 5,368).

line · Mercedes-Benz B-Class · Age 3 median · 19126 vs baseline · 2024
Age 3 median: 19126. Age 19 P75 (rough : 126889. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Age 3 median19126miles20241338
Age 3 P2513027miles20241338
Age 3 P7526706miles20241338
Age 4 median22910miles20242806
Age 4 P2515184miles20242806
Age 4 P7531904miles20242806
Age 5 median27138miles20244181
Age 5 P2518525miles20244181
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Age 5 P7537152miles20244181
Age 6 median34665miles20243982
Age 6 P2524594miles20243982
Age 6 P7546713miles20243982
Age 7 median44535miles20245710
Age 7 P2531782miles20245710
Age 7 P7559433miles20245710
Age 8 median51212miles20245368
Age 8 P2536697miles20245368
Age 8 P7568653miles20245368
Age 9 median60148miles20245655
Age 9 P2543982miles20245655
Age 9 P7578027miles20245655
Age 10 median68728miles20248265
Age 10 P2551642miles20248265
Age 10 P7588214miles20248265
Age 11 median74542miles20247124
Age 11 P2555666miles20247124
Age 11 P7596332miles20247124
Age 12 median80619miles20245798
Age 12 P2560444miles20245798
Age 12 P75102370miles20245798
Age 13 median80860miles20243571
Age 13 P2562143miles20243571
Age 13 P75100436miles20243571
Age 14 median86122miles20244569
Age 14 P2566985miles20244569
Age 14 P75107673miles20244569
Age 15 median92610miles20244315
Age 15 P2572304miles20244315
Age 15 P75114836miles20244315
Age 16 median97937miles20243495
Age 16 P2577051miles20243495
Age 16 P75120310miles20243495
Age 17 median100022miles20242684
Age 17 P2575696miles20242684
Age 17 P75121900miles20242684
Age 18 median99282miles20242042
Age 18 P2578574miles20242042
Age 18 P75121740miles20242042
Age 19 median (rough estimate)100178miles2024408
Age 19 P25 (rough estimate)80882miles2024408
Age 19 P75 (rough estimate)126889miles2024408

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Does high mileage mean more Mercedes-Benz B-Class MOT failures at the same age?

At ages 10–14, 15.9% of Mercedes-Benz B-Class models with under 40,000 miles failed first time, against 41.8% of those with over 140,000 miles (2024, n = 3,577). Inside this age group, higher mileage goes with more failures.

bar · Mercedes-Benz B-Class · Age 3–5, <40k miles · 8.7 vs baseline · 2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Age 3–5, <40k miles8.7% failed first time20247033
Age 3–5, 40-70k miles16% failed first time20241188
Age 3–5, 70-100k miles (rough estimate: 83 tests, 95% interval 7.6–22.2%)13.3% failed first time202483
Age 6–9, <40k miles12.2% failed first time20247591
Age 6–9, 40-70k miles19.5% failed first time20248828
Age 6–9, 70-100k miles25.4% failed first time20243326
Age 6–9, 100-140k miles31.5% failed first time2024798
Age 6–9, 140k+ miles (rough estimate: 169 tests, 95% interval 26.5–40.5%)33.1% failed first time2024169
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Age 10–14, <40k miles15.9% failed first time20242471
Age 10–14, 40-70k miles25.9% failed first time20249635
Age 10–14, 70-100k miles35.1% failed first time202410490
Age 10–14, 100-140k miles39.8% failed first time20245613
Age 10–14, 140k+ miles41.8% failed first time20241106
Age 15+, <40k miles (rough estimate: 370 tests, 95% interval 19.5–28.1%)23.5% failed first time2024370
Age 15+, 40-70k miles36.5% failed first time20242164
Age 15+, 70-100k miles43.8% failed first time20244413
Age 15+, 100-140k miles48.7% failed first time20244558
Age 15+, 140k+ miles50.2% failed first time20241399

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

How many miles does a Mercedes-Benz B-Class last?

14.8% of Mercedes-Benz B-Class models tested had reached 100,000 miles, and 1.7% had reached 150,000 (2024, n = 57,467).

line · Mercedes-Benz B-Class · 100,000 miles · 14.8 vs baseline · 2024
100,000 miles: 14.8. 200,000 miles: 0.2. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
100,000 miles14.8% of tested cars202457467
150,000 miles1.7% of tested cars20246701
200,000 miles0.2% of tested cars2024640

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Is the Mercedes-Benz B-Class driven more or less than average, and does that change the picture?

Matched on annual mileage as well as age, the Mercedes-Benz B-Class index is 92.4, against 89.2 on age alone (2019–2024, n = 71,436).

slope · Mercedes-Benz B-Class · Age and mileage adjusted index · 92.4 vs 89.2 · 2019–2024
Age and mileage adjusted index: 89.2 vs 92.4. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Age and mileage adjusted index92.4index89.22019–202471436

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Which Mercedes-Benz B-Class fuel fails its MOT less?

There is no real difference between diesel and petrol Mercedes-Benz B-Class models before allowing for age: 28.1% against 26.7% fail first time.

bar · Mercedes-Benz B-Class · Diesel · 28.1 vs other fuels · 2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Diesel28.1% fail first timeother fuels202446297
Petrol26.7% fail first timeother fuels202424741

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Which Mercedes-Benz B-Class engine is best?

For its age, the best Mercedes-Benz B-Class engine is the petrol 1.5–1.8 litre at index 85.9, and the worst the diesel 1.8–2.0 litre at 107.9, where 100 = the model's own average (2024, n = 71,436).

bar · Mercedes-Benz B-Class · Petrol 1.5–1.8 litre · 85.9 vs 100 = model average · 2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Petrol 1.5–1.8 litre85.9index vs model norm100 = model average202461589
Petrol 1.8–2.0 litre89.2index vs model norm100 = model average20248172
Diesel over 2.0 litre94.3index vs model norm100 = model average202442242
Diesel 1.5–1.8 litre96.8index vs model norm100 = model average202461807
Petrol 1.2–1.5 litre103.4index vs model norm100 = model average202455085
Diesel 1.2–1.5 litre104.3index vs model norm100 = model average202482168
Diesel 1.8–2.0 litre107.9index vs model norm100 = model average202477644

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Where in Britain does the Mercedes-Benz B-Class fail its MOT most?

First-time failure rates for the Mercedes-Benz B-Class range from 18.2% to 33.8% by area, before allowing for age: a narrower spread than for the typical model.

map · Mercedes-Benz B-Class · Dundee (DD) · 33.8 vs 27.6 · 2024
Scotland. N. England. Wales. London. S. West. % failing. 22%. 31%. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Dundee (DD)33.8% fail first time27.62024840
Aberdeen (AB)33.5% fail first time27.620241695
Kirkcaldy (KY)33.3% fail first time27.620241033
Shrewsbury (SY)18.2% fail first time27.620241694
Dorchester (DT)20.8% fail first time27.620241476
Carlisle (CA)21.4% fail first time27.620241228
Salisbury (SP)32.2% fail first time27.620241801
Paisley (PA)31.5% fail first time27.62024941
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Cambridge (CB)31.4% fail first time27.620243245
Northampton (NN)30.4% fail first time27.620244608
Bristol (BS)30.1% fail first time27.620247052
Leeds (LS)30.0% fail first time27.620243139
Perth (PH) (rough estimate: 448 tests, 95% interval 25.9–34.3%)29.9% fail first time27.62024448
Hereford (HR)29.8% fail first time27.62024574
Hull (HU)29.7% fail first time27.620242272
Torquay (TQ)29.6% fail first time27.620241636
Wigan (WN)29.6% fail first time27.620241198
Edinburgh (EH)29.5% fail first time27.620243651
Brighton (BN)28.9% fail first time27.620245520
Exeter (EX)28.9% fail first time27.620243396
Watford (WD)28.9% fail first time27.620242533
Guildford (GU)28.8% fail first time27.620245599
Huddersfield (HD)28.8% fail first time27.620241059
Plymouth (PL)28.6% fail first time27.620243496
Canterbury (CT)28.6% fail first time27.620243250
Motherwell (ML)28.6% fail first time27.620241298
Inverness (IV)28.6% fail first time27.62024728
York (YO)28.4% fail first time27.620242456
Darlington (DL)28.1% fail first time27.62024945
Portsmouth (PO)28.1% fail first time27.620245675
Oldham (OL)28.1% fail first time27.620241893
Glasgow (G)27.9% fail first time27.620244582
Liverpool (L)27.6% fail first time27.620245684
Bradford (BD)27.6% fail first time27.620242132
Kilmarnock (KA)27.5% fail first time27.620241392
Bournemouth (BH)27.4% fail first time27.620245026
Newport (NP)27.3% fail first time27.620242373
Manchester (M)27.3% fail first time27.620246588
St Albans (AL)27.2% fail first time27.620241728
Romford (RM)27.1% fail first time27.620244907
Bromley (BR)27.1% fail first time27.620241900
Lincoln (LN)27.1% fail first time27.620241664
Swansea (SA)27.0% fail first time27.620243598
Telford (TF)27.0% fail first time27.62024964
Dumfries (DG) (rough estimate: 456 tests, 95% interval 23.1–31.2%)27.0% fail first time27.62024456
Milton Keynes (MK)26.9% fail first time27.620244977
Harrow (HA)26.9% fail first time27.620245427
Oxford (OX)26.9% fail first time27.620244208
Gloucester (GL)26.8% fail first time27.620243835
Redhill (RH)26.8% fail first time27.620243927
Norwich (NR)26.7% fail first time27.620244096
Luton (LU)26.7% fail first time27.620243195
Newcastle (NE)26.7% fail first time27.620243559
Truro (TR)26.7% fail first time27.620241908
London N (N)26.7% fail first time27.620245266
Medway (ME)26.6% fail first time27.620244375
Colchester (CO)26.6% fail first time27.620243119
Ilford (IG)26.5% fail first time27.620243750
Cleveland (TS)26.5% fail first time27.620242470
Halifax (HX) (rough estimate: 466 tests, 95% interval 22.6–30.6%)26.4% fail first time27.62024466
Cardiff (CF)26.3% fail first time27.620246092
Ipswich (IP)26.2% fail first time27.620243751
Tonbridge (TN)26.1% fail first time27.620245089
Blackpool (FY)26.1% fail first time27.620241852
Coventry (CV)26.0% fail first time27.620245090
Slough (SL)25.8% fail first time27.620244314
Chelmsford (CM)25.7% fail first time27.620245238
Durham (DH)25.7% fail first time27.62024786
Chester (CH)25.7% fail first time27.620243447
Swindon (SN)25.6% fail first time27.620243692
Southampton (SO)25.6% fail first time27.620245276
Southend-on-Sea (SS)25.5% fail first time27.620243640
London E (E)25.4% fail first time27.620245200
Bath (BA)25.4% fail first time27.620242822
London SE (SE)25.3% fail first time27.620247034
Reading (RG)25.0% fail first time27.620247145
London SW (SW)25.0% fail first time27.620243906
Sutton (SM)25.0% fail first time27.620241637
Walsall (WS)24.9% fail first time27.620243076
London W (W)24.9% fail first time27.620242689
Peterborough (PE)24.9% fail first time27.620246726
Falkirk (FK)24.6% fail first time27.62024836
Uxbridge (UB)24.5% fail first time27.620244935
Croydon (CR)24.5% fail first time27.620245098
Crewe (CW)24.5% fail first time27.620241724
Hemel Hempstead (HP)24.4% fail first time27.620245003
Llandudno (LL)24.3% fail first time27.620242473
Bolton (BL)24.3% fail first time27.620242821
Birmingham (B)24.2% fail first time27.6202412105
Sheffield (S)24.1% fail first time27.620245800
Dudley (DY)24.0% fail first time27.620242467
Stoke-on-Trent (ST)24.0% fail first time27.620243678
Warrington (WA)23.9% fail first time27.620243811
Preston (PR)23.8% fail first time27.620243033
Enfield (EN)23.8% fail first time27.620244239
Doncaster (DN)23.7% fail first time27.620244138
London NW (NW)23.6% fail first time27.620247229
Wolverhampton (WV)23.6% fail first time27.620243236
Taunton (TA)23.6% fail first time27.620241863
Worcester (WR)23.5% fail first time27.620241888
Dartford (DA)23.5% fail first time27.620244513
Stevenage (SG)23.0% fail first time27.620243609
Twickenham (TW)22.9% fail first time27.620245423
Galashiels (TD)22.8% fail first time27.62024680
Derby (DE)22.7% fail first time27.620244599
Blackburn (BB)22.7% fail first time27.620242095
Wakefield (WF)22.5% fail first time27.620242617
Lancaster (LA)22.3% fail first time27.620241182
Sunderland (SR)22.0% fail first time27.62024956
Harrogate (HG)21.9% fail first time27.620241004
Nottingham (NG)21.8% fail first time27.620248301
Stockport (SK)21.7% fail first time27.620244046
Kingston upon Thames (KT)21.5% fail first time27.620246621
Leicester (LE)21.4% fail first time27.620246553

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Does a Mercedes-Benz B-Class rust more than average?

Allowing for age, Mercedes-Benz B-Class MOTs record corrosion failures at 1.7 times the national rate: 1.28% of tests against 0.77% (2024 + geographic layers, n = 71,330).

Computed, not measured.

slope · Mercedes-Benz B-Class · Salt belt susceptibility · 1.7 vs 1 · 2024 + geographic layers
Salt belt susceptibility: 1 vs 1.7. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024 + geographic layers)
MeasureValueUnitCompared withYearsTests
Salt belt susceptibility1.7ratio estimate12024 + geographic layers71330

Source: DVSA MOT bulk data · Window: 2024 + geographic layers · n = 71,436 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Is a Mercedes-Benz B-Class ULEZ compliant?

An estimated 56.7% of Mercedes-Benz B-Class models tested are likely ULEZ-compliant, judged from fuel type and first-use date; check a specific car with TfL's vehicle checker (2024).

Computed, not measured.

stacked · Mercedes-Benz B-Class · Likely compliant · 56.7 vs baseline · 2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Likely compliant56.7% estimate202471436

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

What do six years of MOTs show about owning a Mercedes-Benz B-Class?

Of failed Mercedes-Benz B-Class MOTs, 43.3% were retested the same day and a further 53.9% within 10 days; the median failed car passed its retest after 1 day (2019–2024, n = 75,936).

bar · Mercedes-Benz B-Class · Same-day retest · 43.3 vs failed initial tests · 2019–2024
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Same-day retest43.3%failed initial tests2019–202475936
Retest within 10 days53.9%failed initial tests2019–202475936
Clean MOT streak42.0%observed chains2019–202472028
Repeat advisory26.8%observed chains2019–202472028
Decreasing odometer2.0% mileage anomalyobserved chains2019–202476449

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Is low mileage better for a Mercedes-Benz B-Class?

Mercedes-Benz B-Class models aged 5 to 14 doing under 5,000 miles a year failed first time in 18.1% of tests, against 31.4% for those doing 8,000 to 12,000 miles (2019–2024, n = 73,617).

bullet · Mercedes-Benz B-Class · Low-use first-time failure · 18.1 vs 31.4 · 2019–2024
Low-use first-time failure: 18.1 vs 31.4. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Low-use first-time failure18.1%31.42019–202473617
Low-use gap-13.4percentage points8–12k miles2019–202473617

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

How many years is a Mercedes-Benz B-Class likely to last?

Mercedes-Benz B-Class models leave the road sooner than most: at ten years old the typical one has about 4.9 more years of MOTs ahead. This is a forecast from the survival curve and may not come true.

Computed, not measured.

Forecast, not a prediction for a particular car.

bar · Mercedes-Benz B-Class · Age 5 · 9.9 vs baseline · survival forecast
DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (survival forecast)
MeasureValueUnitCompared withYearsTests
Age 59.9years forecastsurvival forecast0
Age 86.9years forecastsurvival forecast0
Age 104.9years forecastsurvival forecast0
Age 123.5years forecastsurvival forecast0
Age 15 (at least; observed only until age 18)1.7years forecastsurvival forecast0

Source: DVSA MOT bulk data · Window: survival forecast · n = 71,436 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Which Mercedes-Benz B-Class models are still on the road?

In 2024, for every 100 Mercedes-Benz B-Class models tested at ages 4 to 6, about 8 were tested at age 18 (2024, n = 2,578).

line · Mercedes-Benz B-Class · Age 3 · 82.3 vs baseline · 2024
Age 3: 82.3. Age 19: 1.3. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Age 382.3% of age 4–6 baseline202425217
Age 490.5% of age 4–6 baseline202427730
Age 5 (at least as many as at ages 4–6)100% of age 4–6 baseline202431499
Age 6 (at least as many as at ages 4–6)100% of age 4–6 baseline202432682
Age 7 (at least as many as at ages 4–6)100% of age 4–6 baseline202435555
Age 8 (at least as many as at ages 4–6)100% of age 4–6 baseline202435115
Age 9 (at least as many as at ages 4–6)100% of age 4–6 baseline202435078
Age 10 (at least as many as at ages 4–6)100% of age 4–6 baseline202433686
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Age 1196.1% of age 4–6 baseline202429454
Age 1284.5% of age 4–6 baseline202425878
Age 1376.4% of age 4–6 baseline202423403
Age 1467% of age 4–6 baseline202420520
Age 1551.1% of age 4–6 baseline202415663
Age 1633.7% of age 4–6 baseline202410313
Age 1718.9% of age 4–6 baseline20245789
Age 188.4% of age 4–6 baseline20242578
Age 191.3% of age 4–6 baseline2024409

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

If a Mercedes-Benz B-Class fails, does it fail again?

Mercedes-Benz B-Class models that fail once are much more likely to fail again: 34% failed the next MOT after a fail, against 22.3% after a pass (test chains 2019–2024). The failure most likely to come back is ‘body, chassis, structure’: 40.9% of those fails recurred at the next MOT.

bullet · Mercedes-Benz B-Class · Repeat after fail · 34 vs 22.3 · 2019–2024
Repeat after fail: 34 vs 22.3. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2019–2024)
MeasureValueUnitCompared withYearsTests
Repeat after fail34%22.32019–202418976

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Which Mercedes-Benz B-Class faults come together?

On Mercedes-Benz B-Class models, ‘noise, emissions and leaks’ and seat belts and supplementary restraint systems failures turn up together 6.2 times as often as chance would predict (2024, n = 619).

Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Noise, emissions and leaks + Seat belts and supplementary restraint systems6.2liftexpected joint rate2024619
Identification of the vehicle + Steering (rough estimate: 24 tests, 95% interval 3.7–8.6)5.8liftexpected joint rate202424
Body, chassis, structure + Steering (rough estimate: 479 tests, 95% interval 5.2–6.2)5.7liftexpected joint rate2024479
Brakes + Steering5.5liftexpected joint rate2024533
Road Wheels + Seat belts and supplementary restraint systems (rough estimate: 149 tests, 95% interval 4.6–6.3)5.4liftexpected joint rate2024149
Identification of the vehicle + Noise, emissions and leaks (rough estimate: 115 tests, 95% interval 4.3–6.3)5.3liftexpected joint rate2024115
Noise, emissions and leaks + Steering (rough estimate: 200 tests, 95% interval 4.5–6.0)5.2liftexpected joint rate2024200
Brakes + Noise, emissions and leaks5liftexpected joint rate20242565
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Identification of the vehicle + Road Wheels (rough estimate: 30 tests, 95% interval 3.4–7.1)5.0liftexpected joint rate202430
Road Wheels + Steering (rough estimate: 51 tests, 95% interval 3.6–6.4)4.8liftexpected joint rate202451
Identification of the vehicle + Seat belts and supplementary restraint systems (rough estimate: 51 tests, 95% interval 3.5–6.2)4.7liftexpected joint rate202451
Body, chassis, structure + Noise, emissions and leaks4.6liftexpected joint rate20242048
Brakes + Identification of the vehicle (rough estimate: 245 tests, 95% interval 3.9–5.0)4.4liftexpected joint rate2024245
Lamps, reflectors and electrical equipment + Seat belts and supplementary restraint systems4.3liftexpected joint rate20241670
Lamps, reflectors and electrical equipment + Noise, emissions and leaks4.3liftexpected joint rate20243279
Brakes + Seat belts and supplementary restraint systems4.2liftexpected joint rate20241076
Seat belts and supplementary restraint systems + Steering (rough estimate: 78 tests, 95% interval 3.2–5.1)4.1liftexpected joint rate202478
Steering + Suspension4.1liftexpected joint rate2024598
Body, chassis, structure + Brakes4liftexpected joint rate20244552
Identification of the vehicle + Lamps, reflectors and electrical equipment (rough estimate: 336 tests, 95% interval 3.6–4.5)4liftexpected joint rate2024336
Noise, emissions and leaks + Road Wheels (rough estimate: 218 tests, 95% interval 3.4–4.5)3.9liftexpected joint rate2024218
Lamps, reflectors and electrical equipment + Steering3.9liftexpected joint rate2024570
Identification of the vehicle + Visibility (rough estimate: 206 tests, 95% interval 3.3–4.4)3.9liftexpected joint rate2024206
Brakes + Lamps, reflectors and electrical equipment3.8liftexpected joint rate20247504
Brakes + Suspension3.7liftexpected joint rate20247313
Road Wheels + Tyres3.7liftexpected joint rate2024580
Noise, emissions and leaks + Visibility3.6liftexpected joint rate20241761
Lamps, reflectors and electrical equipment + Road Wheels3.5liftexpected joint rate2024756
Seat belts and supplementary restraint systems + Visibility3.5liftexpected joint rate2024857
Noise, emissions and leaks + Suspension3.4liftexpected joint rate20242597
Body, chassis, structure + Seat belts and supplementary restraint systems3.4liftexpected joint rate2024744
Body, chassis, structure + Suspension3.3liftexpected joint rate20245710
Body, chassis, structure + Lamps, reflectors and electrical equipment3.3liftexpected joint rate20245699
Identification of the vehicle + Tyres (rough estimate: 206 tests, 95% interval 2.9–3.8)3.3liftexpected joint rate2024206
Steering + Visibility (rough estimate: 310 tests, 95% interval 3.0–3.7)3.3liftexpected joint rate2024310
Brakes + Visibility3.3liftexpected joint rate20244107
Body, chassis, structure + Identification of the vehicle (rough estimate: 158 tests, 95% interval 2.8–3.8)3.3liftexpected joint rate2024158
Identification of the vehicle + Suspension (rough estimate: 270 tests, 95% interval 2.9–3.6)3.2liftexpected joint rate2024270
Lamps, reflectors and electrical equipment + Visibility3.2liftexpected joint rate20246060
Brakes + Road Wheels (rough estimate: 447 tests, 95% interval 2.9–3.5)3.2liftexpected joint rate2024447
Road Wheels + Visibility (rough estimate: 423 tests, 95% interval 2.8–3.4)3.1liftexpected joint rate2024423
Seat belts and supplementary restraint systems + Tyres3.1liftexpected joint rate2024875
Lamps, reflectors and electrical equipment + Suspension3.1liftexpected joint rate20249083
Seat belts and supplementary restraint systems + Suspension3.0liftexpected joint rate20241161
Body, chassis, structure + Visibility3.0liftexpected joint rate20243249
Noise, emissions and leaks + Tyres2.9liftexpected joint rate20241658
Road Wheels + Suspension2.9liftexpected joint rate2024616
Brakes + Tyres2.8liftexpected joint rate20244062
Body, chassis, structure + Road Wheels (rough estimate: 337 tests, 95% interval 2.5–3.0)2.7liftexpected joint rate2024337
Lamps, reflectors and electrical equipment + Tyres2.6liftexpected joint rate20245739
Suspension + Visibility2.6liftexpected joint rate20244932
Tyres + Visibility2.4liftexpected joint rate20243384
Steering + Tyres (rough estimate: 255 tests, 95% interval 2.1–2.7)2.4liftexpected joint rate2024255
Suspension + Tyres2.2liftexpected joint rate20244719
Body, chassis, structure + Tyres1.9liftexpected joint rate20242380
Brakes + Seat belt installation check (seen together; too few for a multiplier)9tests with both20249
Body, chassis, structure + Seat belt installation check (seen together; too few for a multiplier)6tests with both20246
Seat belt installation check + Tyres (seen together; too few for a multiplier)6tests with both20246
Seat belt installation check + Suspension (seen together; too few for a multiplier)6tests with both20246

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Has the Mercedes-Benz B-Class had safety recalls?

DVSA lists 65 safety recall campaigns matched to the Mercedes-Benz B-Class; check whether yours has been fixed, using its registration number.

Mercedes-Benz B-Class: the numbers behind this answer (DVSA register)
MeasureValueUnitCompared withYearsTests
DVSA recall campaigns matched65campaignsDVSA registerDVSA register71436

Source: DVSA register; recall effect covers 11 of 761 models · Window: DVSA register · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

What does a Mercedes-Benz B-Class cost to run in a fleet?

Of every 100 Mercedes-Benz B-Class models tested at age 5, about 11 failed the MOT first time; at age 10, about 26. These are one-year rates for different cars tested in the same year, not a fleet followed over time; the steepest one-year step in this cross-section is between cars aged 12 and 13, 11.46 percentage points (2024).

Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
Age 3 (rough estimate: 1,338 tests, 95% interval 7.3–10.3%)8.7% fail first time20241338
Age 49.0% fail first time20242806
Age 510.8% fail first time20244181
Age 614.0% fail first time20243982
Age 717.2% fail first time20245710
Age 819.5% fail first time20245368
Age 921.5% fail first time20245655
Age 1025.9% fail first time20248265
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
Age 1128.5% fail first time20247124
Age 1229.7% fail first time20245798
Age 1341.1% fail first time20243571
Age 1441.9% fail first time20244569
Age 1543.6% fail first time20244315
Age 1645.6% fail first time20243495
Age 1744.7% fail first time20242684
Age 1844.2% fail first time20242042
Age 19 (rough estimate: 408 tests, 95% interval 38.9–48.5%)43.6% fail first time2024408

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Does the Mercedes-Benz B-Class fail inspections in other countries too?

In the Netherlands, 41.2% of Mercedes-Benz B-Class models failed their periodic roadworthiness inspection, against 50.8% for all cars there (2024 by country, n = 37,862 inspections).

Both readings are shown: this comparison changes when usage or inspection rules differ.

Inspections abroad disagree: Finland and the Netherlands point the same way as Britain, Norway do not. Test rules, climate and how the vehicles are used differ, so both readings are shown.

bullet · Mercedes-Benz B-Class · Norway · 37.2 vs 33.7 · 2024 by country
Norway: 37.2 vs 33.7. Finland: 24.1 vs 26.3. Netherlands: 41.2 vs 50.8. Statens vegvesen PKK (CC BY 4.0), Traficom Katsastus (CC BY 4.0), RDW APK (CC0), adapted; covers 430 of 761 models, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024 by country)
MeasureValueUnitCompared withYearsTests
Norway37.2% failed33.72024 by country9122
Finland24.1% failed26.32024 by country6094
Netherlands41.2% failed50.82024 by country37862

Source: Statens vegvesen PKK (CC BY 4.0), Traficom Katsastus (CC BY 4.0), RDW APK (CC0), adapted; covers 430 of 761 models · Window: 2024 by country · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV · licences and full notice

Does the month of a Mercedes-Benz B-Class MOT matter?

Mercedes-Benz B-Class models fail first time most in November (27.5%, against 30.6% for all cars that month) and least in March (23.8%) (2024, n = 71,436).

line · Mercedes-Benz B-Class · January · 27.1 vs 31.1 · 2024
January: 27.1. December: 27.3. DVSA MOT bulk data, 24 Sep 2026.
Mercedes-Benz B-Class: the numbers behind this answer (2024)
MeasureValueUnitCompared withYearsTests
January27.1% fail first time31.1202433208
February25.1% fail first time30.0202433082
March23.8% fail first time28.3202440614
April26.6% fail first time29.8202422465
May24.8% fail first time28.8202426290
June24.9% fail first time28.1202431697
July26.0% fail first time29.3202431405
August25.6% fail first time29.2202432520
Full table
Further values · 2024
MeasureValueUnitCompared withYearsTests
September25.2% fail first time28.2202440790
October27.0% fail first time30.3202439843
November27.5% fail first time30.6202434940
December27.3% fail first time29.3202424439

Source: DVSA MOT bulk data · Window: 2024 · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

Not enough tests for… (and why)

What have dealers been told about the Mercedes-Benz B-Class? (US market)

layer not yet computed for this model (covers 211 of 761 models). 71,436 initial Mercedes-Benz B-Class tests are in the published model cohort.

Source: NHTSA, US market; covers 211 of 761 models · Window: NHTSA · n = 71,436 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

See the Ford Kuga, a car of the same inspection class with 3.6× the tests · Check your car by registration

Real-world MPG against the official figure (manufacturer level)

layer not yet computed for this model (covers 19 of 761 models). 71,436 initial Mercedes-Benz B-Class tests are in the published model cohort.

Source: European Commission OBFCM; covers 19 of 761 models · Window: 2021+ cohorts · n = 71,436 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV

See the Ford Kuga, a car of the same inspection class with 3.6× the tests · Check your car by registration

How to cite this page

MOT Risk Index (2026). Mercedes-Benz B-Class MOT statistics 2024 (data release dvsa-2024-v2; full dataset motriskindex-families-2024-v5, DOI 10.5281/zenodo.22975051), updated 24 September 2026. motriskindex.co.uk/cars/mercedes-b-class/

How the MOT Risk Index and every figure on this page are calculated: methodology.

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Mercedes-Benz B-Class MOT: quick answers

What is the Mercedes-Benz B-Class first-time MOT pass rate?

72.4% of first attempts passed in 2024 (71,436 tests). Retests after repair are excluded; cars fixed at the test centre (PRS) are shown separately.

Why does this number differ from other sites?

Other sites may count retests or all attempts. This page uses 71,436 primary tests: 27.58% failed first time and 77.0% passed when cars fixed at the test centre (PRS) count as passes. The age-adjusted MOT Risk Index 91.8 is shown separately.