Mercedes-Benz B 2014: MOT failure rate for its age
19.6% of 2,041 MOT tests of the Mercedes-Benz B first registered in 2014 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 95.3 (95% CI 86.0–104.6; 100 = normal for this model at that age): the 2014 build year is no different from other years of the same model at the same age. This is a rough estimate from a smaller sample.
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Failed first time | 19.6 | % | all ages tested | 2019–2024 | 2041 |
| Index against this model at the same age (95% CI 86.0–104.6) | 95.3 | index | 100 = normal for this model at that age | 2019–2024 | 2041 |
| Rank among this model's 2 build years | 2 | of 2 | 1 = fails least for its age | 2019–2024 | 2041 |
| Tested in 2024 | 11 | tests | median 61,107 miles | 2024 | 11 |
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).
How does the 2014 Mercedes-Benz B fail at each age?
Cars built in 2014 were tested at ages 5 to 6 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.
| Age | Tests | Failed, % | 95% interval | Normal for this model at that age, % | Index (100 = normal) |
|---|---|---|---|---|---|
| 5 | 1,042 | 19.9 | 17.6–22.4 | 21.6 | 92 |
| 6 | 999 | 19.3 | 17–21.9 | 19.5 | 99.2 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,041 (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 2014 Mercedes-Benz B?
The most common failure group on cars built in 2014 is tyres: 9.8 items per 100 first tests, against 7.8 across all build years of the Mercedes-Benz B. These counts are not age-adjusted: cars built in 2014 were tested at ages 5 to 6.
| Failure group | Built 2014, per 100 | All build years, per 100 | Items |
|---|---|---|---|
| Tyres | 9.8 | 7.8 | 204 |
| Lamps, reflectors and electrical equipment | 8.3 | 6.1 | 172 |
| Visibility | 4.6 | 4.2 | 96 |
| Brakes | 4 | 3.2 | 83 |
| Noise, emissions and leaks | 2.1 | 1.5 | 44 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,076 (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 2014 compare with the years around it?
Among the 2 published build years of the Mercedes-Benz B, 2014 ranks 2 (1 = fails least for its age). 2019: index 41.3.
| Build year | Index (100 = normal) | 95% interval | Verdict | Tests |
|---|---|---|---|---|
| 2014 | 95.3 | 86.0–104.6 | no different (rough estimate) | 2,041 |
| 2019 | 41.3 | 19.7–63.0 | better (rough estimate) | 232 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,273 (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 B 2014 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-b/2014/
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.
Other pages for this model
Mercedes-Benz B 2019 · Mercedes-Benz B by postcode area · Mercedes-Benz B body, chassis and structure failures · Mercedes-Benz B brakes failures · Mercedes-Benz B lamps, reflectors and electrics failures · Mercedes-Benz B noise, emissions and leaks failures · Mercedes-Benz B seat belts and airbags failures · Mercedes-Benz B suspension failures · Mercedes-Benz B tyres failures · Mercedes-Benz B visibility failures