Mercedes-Benz GLC 2020: MOT failure rate for its age

9.1% of 23,269 MOT tests of the Mercedes-Benz GLC first registered in 2020 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 97.8 (95% CI 93.6–101.9; 100 = normal for this model at that age): the 2020 build year is no different from other years of the same model at the same age.

Mercedes-Benz GLC built in 2020 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	9.1	%	all ages tested	2019–2024	23269
Index against this model at the same age (95% CI 93.6–101.9)	97.8	index	100 = normal for this model at that age	2019–2024	23269
Rank among this model's 6 build years	2	of 6	1 = fails least for its age	2019–2024	23269
Tested in 2024	11445	tests	median 33,505 miles	2024	11445

Built 2020 against Mercedes-Benz GLC normal for the age: first-time MOT failure share at each age, age 3: 8.6% vs 8.9%; age 4: 9.7% vs 9.8%. Axis from 0% to 10%. DVSA MOT bulk data, 2019–2024.

Check a 2020 Mercedes-Benz GLC by registration · All Mercedes-Benz GLC MOT statistics · Download the build-year table (CSV)

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).

How does the 2020 Mercedes-Benz GLC fail at each age?

Cars built in 2020 were tested at ages 3 to 4 between 2019 and 2024. Each row compares their first-time failure share with what this model normally shows at that age, after allowing for the overall failure level of each test year.

Mercedes-Benz GLC built 2020: first-time MOT failure by age, against the model's normal rate at that age (2019–2024)
Age	Tests	Failed, %	95% interval	Normal for this model at that age, %	Index (100 = normal)
3	11,824	8.6	8.1–9.1	8.9	96.7
4	11,445	9.7	9.2–10.2	9.8	98.7

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 23,269 (initial tests) · Method: normal rate = this model's first-time failure share at that age across its build years (cells of 400+ tests), adjusted for each test year's overall level; cells of 30+ tests, under 500 marked rough · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

What fails most on the 2020 Mercedes-Benz GLC?

The most common failure group on cars built in 2020 is tyres: 7 items per 100 first tests, against 6.4 across all build years of the Mercedes-Benz GLC. These counts are not age-adjusted: cars built in 2020 were tested at ages 3 to 4.

Failure items per 100 first tests, Mercedes-Benz GLC built 2020 against the Mercedes-Benz GLC in all build years (2019–2024, not age-adjusted)
Failure group	Built 2020, per 100	All build years, per 100	Items
Tyres	7	6.4	1,656
Visibility	4.1	3.8	958
Brakes	1.6	2	382
Lamps, reflectors and electrical equipment	0.6	0.8	153
Suspension	0.6	3.1	151

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 23,646 (initial tests of this build year) · Method: failure items grouped by DVSA's top-level defect groups, per 100 initial tests; groups with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How does 2020 compare with the years around it?

Among the 6 published build years of the Mercedes-Benz GLC, 2020 ranks 2 (1 = fails least for its age). 2019: index 97.5.

Mercedes-Benz GLC build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2015	101.4	95.6–107.2	no different	8,223
2016	103.2	100.9–105.6	worse	57,335
2017	103.9	101.6–106.1	worse	67,894
2018	103.6	101.5–105.7	worse	79,445
2019	97.5	94.9–100.2	no different	53,190
2020	97.8	93.6–101.9	no different	23,269

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 289,356 (initial tests) · Method: observed failures against those expected for the same model at the same ages, test-year level adjusted; verdict follows the printed one-decimal bound · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How to cite this page

MOT Risk Index (2026). Mercedes-Benz GLC 2020 MOT statistics (data release dvsa-2024-v2; full dataset motriskindex-families-2024-v5, DOI 10.5281/zenodo.22975051), updated 30 September 2026. motriskindex.co.uk/cars/mercedes-glc/2020/

How every figure is calculated: methodology. Age, test year and build year are tied together (age = test year − build year), so the test-year level is taken as observed, not estimated.

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