83.1% of Porsche 928s passed the 2024 MOT (a rough estimate from 717 first tests): 80.1% at the first attempt and 3.1% after a fix at the test centre (PRS), each rounded separately. About 1 in 5 failed the first attempt. For its age, it fails 43% less often than normal: MOT Risk Index 56.8 (95% CI 48.9–65.6; 100 = normal).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| MOT pass rate | 83.1 | % | incl. 3.1% fixed at the test centre | 2024 | 717 |
| Passed at the first attempt | 80.1 | % | all first tests | 2024 | 717 |
| MOT Risk Index (95% CI 48.9–65.6) | 56.8 | index | 100 = normal for its age · rank 124 of 761 (1 = fails least for its age) | 2024 | 717 |
| Biggest excess: Steering | 7.0 | per 100 | 7.6 same-age | 2019–2024 | 5000 |
| Dangerous defects | 4.4 | per 100 | 11.2 UK, not age-adjusted | 2019–2024 | 5000 |
| Advisory items | 98.2 | per 100 | 127.1 UK, not age-adjusted | 2019–2024 | 5000 |
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Rank | 124 | of 761 | published models, 1 = fails least for its age | 2024 | 717 |
| Best rank within its 95% interval | 98 | rank | other models held where they are | 2024 | 717 |
| Worst rank within its 95% interval | 166 | rank | other models held where they are | 2024 | 717 |
Data release dvsa-2024-v2 (24 Sep 2026) · full dataset (v5). This model's index changed from 55.0 to 56.8 in the 24 September 2026 release, after duplicate test records were removed.
Porsche 928 MOTs fail most often on ‘lamps, reflectors and electrical equipment’: 25.9 per 100 tests, against 29.4 for UK cars of the same age (2019–2024, n = 5,000).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Lamps, reflectors and electrical equipment | 25.9 | per 100 | 29.4 | 2019–2024 | 1294 |
| Brakes | 9.6 | per 100 | 20.3 | 2019–2024 | 481 |
| Visibility | 8.6 | per 100 | 10.6 | 2019–2024 | 432 |
| Body, chassis, structure | 8.1 | per 100 | 15.0 | 2019–2024 | 406 |
| Steering | 7 | per 100 | 7.6 | 2019–2024 | 350 |
| Noise, emissions and leaks | 6 | per 100 | 7.3 | 2019–2024 | 300 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 5,000 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Porsche 928 advisories turn into fails less often than on the median model; the one to watch is noise, emissions and leaks: advisories on it became a fail at the next MOT 5.5% of the time.
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Noise, emissions and leaks | 5.5 | % next fail | median model | 2019–2024 | 510 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Porsche 928 MOTs flag suspension most: 23.4 advisories per 100 tests, against 26.2 across UK tests (2019–2024, n = 5,000).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Suspension | 23.4 | per 100 | 26.2 | 2019–2024 | 1171 |
| Noise, emissions and leaks | 17.7 | per 100 | 5.2 | 2019–2024 | 884 |
| Tyres | 17.7 | per 100 | 39.7 | 2019–2024 | 883 |
| Brakes | 17.3 | per 100 | 34.7 | 2019–2024 | 864 |
| Non-component advisories | 12.1 | per 100 | 7.8 | 2019–2024 | 606 |
| Body, chassis, structure | 4.1 | per 100 | 4.6 | 2019–2024 | 203 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 5,000 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
For Porsche 928s aged 20 or older whose last MOT was a pass, the item most likely to fail at the next MOT is ‘lamps, reflectors and electrical equipment’: 8.6% failed on it (2019–2024, n = 1,942).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Lamps, reflectors and electrical equipment, 20 years or older, after a pass | 8.6 | % next fail | 2019–2024 | 1942 | |
| Body, chassis, structure, 20 years or older, after a pass | 4.3 | % next fail | 2019–2024 | 1942 | |
| Visibility, 20 years or older, after a pass | 4.1 | % next fail | 2019–2024 | 1942 | |
| Noise, emissions and leaks, 20 years or older, after a pass | 4.0 | % next fail | 2019–2024 | 1942 | |
| Brakes, 20 years or older, after a pass | 3.5 | % next fail | 2019–2024 | 1942 | |
| Steering, 20 years or older, after a pass | 3.1 | % next fail | 2019–2024 | 1942 | |
| Suspension, 20 years or older, after a pass | 2.4 | % next fail | 2019–2024 | 1942 | |
| Tyres, 20 years or older, after a pass | 1.0 | % next fail | 2019–2024 | 1942 |
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Identification of the vehicle, 20 years or older, after a pass | 0.6 | % next fail | 2019–2024 | 1942 | |
| Seat belts and supplementary restraint systems, 20 years or older, after a pass | 0.3 | % next fail | 2019–2024 | 1942 | |
| Lamps, reflectors and electrical equipment, 20 years or older, after an advisory | 14.2 | % next fail | 2019–2024 | 809 | |
| Visibility, 20 years or older, after an advisory | 9.0 | % next fail | 2019–2024 | 809 | |
| Body, chassis, structure, 20 years or older, after an advisory | 7.7 | % next fail | 2019–2024 | 809 | |
| Steering, 20 years or older, after an advisory | 7.2 | % next fail | 2019–2024 | 809 | |
| Brakes, 20 years or older, after an advisory | 5.8 | % next fail | 2019–2024 | 809 | |
| Noise, emissions and leaks, 20 years or older, after an advisory | 5.1 | % next fail | 2019–2024 | 809 | |
| Suspension, 20 years or older, after an advisory | 4.5 | % next fail | 2019–2024 | 809 | |
| Seat belts and supplementary restraint systems, 20 years or older, after an advisory | 1.8 | % next fail | 2019–2024 | 809 | |
| Tyres, 20 years or older, after an advisory | 1.8 | % next fail | 2019–2024 | 809 | |
| Identification of the vehicle, 20 years or older, after an advisory | 0.7 | % next fail | 2019–2024 | 809 | |
| Lamps, reflectors and electrical equipment, 20 years or older, after a fail | 17 | % next fail | 2019–2024 | 859 | |
| Visibility, 20 years or older, after a fail | 8.6 | % next fail | 2019–2024 | 859 | |
| Steering, 20 years or older, after a fail | 7.4 | % next fail | 2019–2024 | 859 | |
| Noise, emissions and leaks, 20 years or older, after a fail | 5.9 | % next fail | 2019–2024 | 859 | |
| Body, chassis, structure, 20 years or older, after a fail | 5.6 | % next fail | 2019–2024 | 859 | |
| Brakes, 20 years or older, after a fail | 5.1 | % next fail | 2019–2024 | 859 | |
| Suspension, 20 years or older, after a fail | 4.5 | % next fail | 2019–2024 | 859 | |
| Tyres, 20 years or older, after a fail | 1.3 | % next fail | 2019–2024 | 859 | |
| Seat belts and supplementary restraint systems, 20 years or older, after a fail | 1.1 | % next fail | 2019–2024 | 859 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
The Porsche 928 gets a dangerous defect less often than the UK average: 4.4 per 100 first tests against 11.2 across the UK. In the same tests, 57.5 major and 13.6 minor defects were recorded per 100 tests (one test can record several).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Dangerous defects | 4.4 | per 100 | 11.2 | 2019–2024 | 5000 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 5,000 (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
Expected repair cost per Porsche 928 MOT: about £63 (up to about £119 if more expensive parts are needed), from the chance of failing each item and its most common UK repair price (catalogue estimate, n = 717).
Computed, not measured.
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Expected repair bill | 62.7 | GBP estimate | modal price catalogue | price catalogue | 717 |
| Estimated range lower | 62.7 | GBP estimate | modal price catalogue | price catalogue | 717 |
| Estimated range upper | 119.0 | GBP estimate | modal price catalogue | price catalogue | 717 |
| Lamps, reflectors and electrical equipment: Battery replacement (standard 12V lead-acid) | 36.3 | GBP expected contribution | 140 | price catalogue | 717 |
| Brakes: Front brake pads (parts + labour, typical hatchback) | 14.4 | GBP expected contribution | 150 | price catalogue | 717 |
| Noise, emissions and leaks: Exhaust rear silencer | 12 | GBP expected contribution | 200 | price catalogue | 717 |
Source: DVSA MOT bulk data · Window: price catalogue · n = 717 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Of 8 similar models, 6 fail less often for their age than the Porsche 928 and 2 as often or more. The Porsche 928 has an MOT Risk Index of 56.8, where 100 = normal for its age (2024, n = 717).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Porsche 928 (this model) | 56.8 | index | 100 = normal | 2024 | 717 |
| Vauxhall Nova | 54.5 | index | 56.8 | 2024 | 868 |
| Porsche Carrera | 43.1 | index | 56.8 | 2024 | 853 |
| Bentley Turbo | 51.6 | index | 56.8 | 2024 | 797 |
| Toyota Aqua | 63.7 | index | 56.8 | 2024 | 728 |
| Ferrari Portofino | 47.3 | index | 56.8 | 2024 | 695 |
| Abarth 124 | 55.8 | index | 56.8 | 2024 | 1830 |
| Nissan 200 | 47 | index | 56.8 | 2024 | 794 |
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Maserati Quattroporte | 61.6 | index | 56.8 | 2024 | 1337 |
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
56.5% of Porsche 928s tested had reached 100,000 miles, and 13.7% had reached 150,000 (2024, n = 2,807).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| 100,000 miles | 56.5 | % of tested cars | 2024 | 2807 | |
| 150,000 miles | 13.7 | % of tested cars | 2024 | 681 | |
| 200,000 miles (rough estimate: 118 tests, 95% interval 2.0–2.8%) | 2.4 | % of tested cars | 2024 | 118 |
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Matched on annual mileage as well as age, the Porsche 928 index is 73.8, against 75.3 on age alone (2019–2024, n = 717).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Age and mileage adjusted index | 73.8 | index | 75.3 | 2019–2024 | 717 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Porsche 928 fails first-time MOTs most in Bolton (BL): 30.9% against 23.4% across Britain for this model, both 2019–2024 (2024, n = 168).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Bolton (BL) (rough estimate: 168 tests, 95% interval 24.5–38.3%) | 30.9 | % fail first time | 19.9 | 2024 | 168 |
| Guildford (GU) (rough estimate: 125 tests, 95% interval 23.0–38.9%) | 30.4 | % fail first time | 19.9 | 2024 | 125 |
| Redhill (RH) (rough estimate: 109 tests, 95% interval 18.4–34.6%) | 25.7 | % fail first time | 19.9 | 2024 | 109 |
| Gloucester (GL) (rough estimate: 250 tests, 95% interval 8.5–16.6%) | 12 | % fail first time | 19.9 | 2024 | 250 |
| Birmingham (B) (rough estimate: 105 tests, 95% interval 11.1–25.5%) | 17.1 | % fail first time | 19.9 | 2024 | 105 |
| Kingston upon Thames (KT) (rough estimate: 113 tests, 95% interval 13.2–27.7%) | 19.5 | % fail first time | 19.9 | 2024 | 113 |
| Tonbridge (TN) (rough estimate: 153 tests, 95% interval 18.7–32.2%) | 24.8 | % fail first time | 19.9 | 2024 | 153 |
| Peterborough (PE) (rough estimate: 111 tests, 95% interval 15.0–30.2%) | 21.6 | % fail first time | 19.9 | 2024 | 111 |
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Reading (RG) (rough estimate: 122 tests, 95% interval 13.6–27.6%) | 19.7 | % fail first time | 19.9 | 2024 | 122 |
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Of failed Porsche 928 MOTs, 21.4% were retested the same day and a further 66.8% within 10 days; the median failed car passed its retest after 3 days (2019–2024, n = 660).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Same-day retest | 21.4 | % | failed initial tests | 2019–2024 | 660 |
| Retest within 10 days | 66.8 | % | failed initial tests | 2019–2024 | 660 |
| Clean MOT streak | 48.9 | % | observed chains | 2019–2024 | 936 |
| Repeat advisory | 19.8 | % | observed chains | 2019–2024 | 936 |
| Decreasing odometer | 5.1 | % mileage anomaly | observed chains | 2019–2024 | 1124 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
19.8% of Porsche 928s that failed an MOT failed the next one too, against 17.7% after a pass (2019–2024, n = 363). The failure most likely to come back is steering: 31.0% of those fails recurred at the next MOT.
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Repeat after fail | 19.8 | % | 17.7 | 2019–2024 | 363 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
On Porsche 928s, identification of the vehicle and ‘lamps, reflectors and electrical equipment’ failures turn up together 5.8 times as often as chance would predict (2024, n = 26).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Identification of the vehicle + Lamps, reflectors and electrical equipment (rough estimate: 26 tests, 95% interval 3.8–8.5) | 5.8 | lift | expected joint rate | 2024 | 26 |
| Brakes + Suspension (rough estimate: 62 tests, 95% interval 4.2–7.1) | 5.5 | lift | expected joint rate | 2024 | 62 |
| Lamps, reflectors and electrical equipment + Seat belts and supplementary restraint systems (rough estimate: 31 tests, 95% interval 3.5–7.3) | 5.1 | lift | expected joint rate | 2024 | 31 |
| Brakes + Tyres (rough estimate: 22 tests, 95% interval 3.2–7.7) | 5.1 | lift | expected joint rate | 2024 | 22 |
| Steering + Suspension (rough estimate: 50 tests, 95% interval 3.5–6.1) | 4.7 | lift | expected joint rate | 2024 | 50 |
| Brakes + Visibility (rough estimate: 86 tests, 95% interval 3.6–5.5) | 4.5 | lift | expected joint rate | 2024 | 86 |
| Brakes + Lamps, reflectors and electrical equipment (rough estimate: 162 tests, 95% interval 3.7–5.1) | 4.4 | lift | expected joint rate | 2024 | 162 |
| Suspension + Visibility (rough estimate: 60 tests, 95% interval 3.3–5.6) | 4.4 | lift | expected joint rate | 2024 | 60 |
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Lamps, reflectors and electrical equipment + Visibility (rough estimate: 196 tests, 95% interval 3.7–5.0) | 4.3 | lift | expected joint rate | 2024 | 196 |
| Lamps, reflectors and electrical equipment + Suspension (rough estimate: 113 tests, 95% interval 3.5–5.2) | 4.3 | lift | expected joint rate | 2024 | 113 |
| Brakes + Steering (rough estimate: 58 tests, 95% interval 2.9–5.0) | 3.8 | lift | expected joint rate | 2024 | 58 |
| Lamps, reflectors and electrical equipment + Noise, emissions and leaks (rough estimate: 119 tests, 95% interval 3.0–4.4) | 3.6 | lift | expected joint rate | 2024 | 119 |
| Noise, emissions and leaks + Visibility (rough estimate: 61 tests, 95% interval 2.7–4.6) | 3.6 | lift | expected joint rate | 2024 | 61 |
| Body, chassis, structure + Brakes (rough estimate: 57 tests, 95% interval 2.6–4.5) | 3.5 | lift | expected joint rate | 2024 | 57 |
| Lamps, reflectors and electrical equipment + Tyres (rough estimate: 35 tests, 95% interval 2.4–4.8) | 3.5 | lift | expected joint rate | 2024 | 35 |
| Brakes + Noise, emissions and leaks (rough estimate: 48 tests, 95% interval 2.5–4.6) | 3.4 | lift | expected joint rate | 2024 | 48 |
| Body, chassis, structure + Suspension (rough estimate: 39 tests, 95% interval 2.4–4.6) | 3.4 | lift | expected joint rate | 2024 | 39 |
| Lamps, reflectors and electrical equipment + Steering (rough estimate: 118 tests, 95% interval 2.8–4.0) | 3.3 | lift | expected joint rate | 2024 | 118 |
| Body, chassis, structure + Lamps, reflectors and electrical equipment (rough estimate: 118 tests, 95% interval 2.6–3.7) | 3.1 | lift | expected joint rate | 2024 | 118 |
| Body, chassis, structure + Visibility (rough estimate: 59 tests, 95% interval 2.3–3.8) | 3.0 | lift | expected joint rate | 2024 | 59 |
| Body, chassis, structure + Steering (rough estimate: 45 tests, 95% interval 2.1–3.9) | 2.9 | lift | expected joint rate | 2024 | 45 |
| Steering + Visibility (rough estimate: 53 tests, 95% interval 2.1–3.7) | 2.9 | lift | expected joint rate | 2024 | 53 |
| Noise, emissions and leaks + Suspension (rough estimate: 24 tests, 95% interval 1.6–3.6) | 2.4 | lift | expected joint rate | 2024 | 24 |
| Body, chassis, structure + Noise, emissions and leaks (rough estimate: 28 tests, 95% interval 1.3–2.8) | 1.9 | lift | expected joint rate | 2024 | 28 |
| Noise, emissions and leaks + Steering (rough estimate: 24 tests, 95% interval 1.1–2.7) | 1.8 | lift | expected joint rate | 2024 | 24 |
| Body, chassis, structure + Tyres (seen together; too few for a multiplier) | 19 | tests with both | 2024 | 19 | |
| Identification of the vehicle + Visibility (seen together; too few for a multiplier) | 18 | tests with both | 2024 | 18 | |
| Tyres + Visibility (seen together; too few for a multiplier) | 18 | tests with both | 2024 | 18 | |
| Seat belts and supplementary restraint systems + Visibility (seen together; too few for a multiplier) | 17 | tests with both | 2024 | 17 | |
| Body, chassis, structure + Identification of the vehicle (seen together; too few for a multiplier) | 15 | tests with both | 2024 | 15 | |
| Suspension + Tyres (seen together; too few for a multiplier) | 15 | tests with both | 2024 | 15 | |
| Steering + Tyres (seen together; too few for a multiplier) | 13 | tests with both | 2024 | 13 | |
| Seat belts and supplementary restraint systems + Suspension (seen together; too few for a multiplier) | 11 | tests with both | 2024 | 11 | |
| Lamps, reflectors and electrical equipment + Road Wheels (seen together; too few for a multiplier) | 11 | tests with both | 2024 | 11 | |
| Noise, emissions and leaks + Seat belts and supplementary restraint systems (seen together; too few for a multiplier) | 10 | tests with both | 2024 | 10 | |
| Seat belts and supplementary restraint systems + Steering (seen together; too few for a multiplier) | 10 | tests with both | 2024 | 10 | |
| Noise, emissions and leaks + Tyres (seen together; too few for a multiplier) | 10 | tests with both | 2024 | 10 | |
| Identification of the vehicle + Steering (seen together; too few for a multiplier) | 9 | tests with both | 2024 | 9 | |
| Brakes + Seat belts and supplementary restraint systems (seen together; too few for a multiplier) | 9 | tests with both | 2024 | 9 | |
| Body, chassis, structure + Seat belts and supplementary restraint systems (seen together; too few for a multiplier) | 8 | tests with both | 2024 | 8 | |
| Road Wheels + Steering (seen together; too few for a multiplier) | 7 | tests with both | 2024 | 7 | |
| Identification of the vehicle + Noise, emissions and leaks (seen together; too few for a multiplier) | 7 | tests with both | 2024 | 7 | |
| Brakes + Identification of the vehicle (seen together; too few for a multiplier) | 7 | tests with both | 2024 | 7 | |
| Lamps, reflectors and electrical equipment + Speedometer and speed limiter (seen together; too few for a multiplier) | 5 | tests with both | 2024 | 5 |
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
Porsche 928s fail first time most in January (27.7%, against 31.1% for all cars that month) and least in March (19.8%) (2024, n = 717).
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| January | 27.7 | % fail first time | 31.1 | 2024 | 267 |
| February | 24.1 | % fail first time | 30.0 | 2024 | 291 |
| March | 19.8 | % fail first time | 28.3 | 2024 | 471 |
| April | 24.2 | % fail first time | 29.8 | 2024 | 459 |
| May | 24.9 | % fail first time | 28.8 | 2024 | 515 |
| June | 23.3 | % fail first time | 28.1 | 2024 | 497 |
| July | 26.6 | % fail first time | 29.3 | 2024 | 500 |
| August | 23.4 | % fail first time | 29.2 | 2024 | 449 |
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| September | 20.7 | % fail first time | 28.2 | 2024 | 469 |
| October | 24.0 | % fail first time | 30.3 | 2024 | 442 |
| November | 21.0 | % fail first time | 30.6 | 2024 | 395 |
| December | 21.2 | % fail first time | 29.3 | 2024 | 245 |
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
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n < 500 in this group. 717 initial Porsche 928 tests are in the published model cohort; this measure needs a qualifying group of at least 500 tests.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
n < 500 in this group. 717 initial Porsche 928 tests are in the published model cohort; this measure needs a qualifying group of at least 500 tests.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 + geographic layers · n = 717 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: survival forecast · n = 717 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA register; recall effect covers 11 of 761 models · Window: DVSA register · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
not computed for this model: no qualifying records. 717 initial Porsche 928 tests are in the published model cohort.
Source: DVSA MOT bulk data · Window: 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
layer not yet computed for this model (covers 211 of 761 models). 717 initial Porsche 928 tests are in the published model cohort.
Source: NHTSA, US market; covers 211 of 761 models · Window: NHTSA · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
layer not yet computed for this model (covers 211 of 761 models). 717 initial Porsche 928 tests are in the published model cohort.
Source: NHTSA, US market; covers 211 of 761 models · Window: NHTSA + 2024 · n = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
no match in the other-country inspection register. 717 initial Porsche 928 tests are in the published model cohort.
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 = 717 (initial tests) · Method: one initial test per test_id · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
layer not yet computed for this model (covers 19 of 761 models). 717 initial Porsche 928 tests are in the published model cohort.
Source: European Commission OBFCM; covers 19 of 761 models · Window: 2021+ cohorts · n = 717 (initial tests) · Method: computed estimate, not measured · Updated: 24 Sep 2026 · Release: dvsa-2024-v2 · CSV
See the Audi S4, a car of the same inspection class with 3.4× the tests · Check your car by registration
MOT Risk Index (2026). Porsche 928 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/porsche-928/
How the MOT Risk Index and every figure on this page are calculated: methodology.
What is wrong on this page? One tap sends the category only, no text and nothing about you.
80.1% of first attempts passed in 2024 (717 tests). Retests after repair are excluded; cars fixed at the test centre (PRS) are shown separately.
Other sites may count retests or all attempts. This page uses 717 primary tests: 19.94% failed first time and 83.1% passed when cars fixed at the test centre (PRS) count as passes. The age-adjusted MOT Risk Index 56.8 is shown separately.