Does the Mercedes-Benz B-Class fail the MOT on body, chassis and structure more than it should?
The Mercedes-Benz B-Class records 6.17 body, chassis and structure failure items per 100 initial MOT tests (2019–2024), against 4.51 expected for a car of the same age mix: more than expected for its class and age (+1.66, 95% interval +1.58 to +1.73). It ranks 189 of 663 models on body, chassis and structure (1 = most failures above expected).
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on body, chassis and structure · check a Mercedes-Benz B-Class by registration
What exactly fails on body, chassis and structure?
The most frequent DVSA defect wording in this group on the Mercedes-Benz B-Class is “A transmission shaft constant velocity joint boot severely deteriorated”, recorded 10,873 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| A transmission shaft constant velocity joint boot severely deteriorated | 10,873 | 2.78 |
| A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc | 9,127 | 2.33 |
| Exhaust system leaking or insecure | 790 | 0.20 |
| Fuel system leaking, or missing or ineffective filler cap | 757 | 0.19 |
| A door will not open using the relevant control or close properly | 615 | 0.16 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 391,293 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
If a Mercedes-Benz B-Class gets a body, chassis and structure advisory, how often does it fail next time?
21.8% of Mercedes-Benz B-Class MOTs with a body, chassis and structure advisory were followed by a fail in the same group at the next MOT, typically 12 months and 5,341 miles later (3,138 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 3,138 (advisories followed) · Method: the same vehicles followed to their next ordinary MOT · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
Other pages for this model
Mercedes-Benz B-Class 2005 · Mercedes-Benz B-Class 2006 · Mercedes-Benz B-Class 2007 · Mercedes-Benz B-Class 2008 · Mercedes-Benz B-Class 2009 · Mercedes-Benz B-Class 2010 · Mercedes-Benz B-Class 2011 · Mercedes-Benz B-Class 2012 · Mercedes-Benz B-Class 2013 · Mercedes-Benz B-Class 2014 · Mercedes-Benz B-Class 2015 · Mercedes-Benz B-Class 2016 · Mercedes-Benz B-Class 2017 · Mercedes-Benz B-Class 2018 · Mercedes-Benz B-Class 2019 · Mercedes-Benz B-Class 2020 · Mercedes-Benz B-Class in Norway · Mercedes-Benz B-Class in Finland · Mercedes-Benz B-Class in the Netherlands · Mercedes-Benz B-Class by postcode area · Mercedes-Benz B-Class brakes failures · Mercedes-Benz B-Class vehicle identification failures · Mercedes-Benz B-Class lamps, reflectors and electrics failures · Mercedes-Benz B-Class noise, emissions and leaks failures · Mercedes-Benz B-Class road wheels failures · Mercedes-Benz B-Class seat belts and airbags failures · Mercedes-Benz B-Class steering failures · Mercedes-Benz B-Class suspension failures · Mercedes-Benz B-Class tyres failures · Mercedes-Benz B-Class visibility failures