Mercedes-Benz B-Class: lighting & signalling MOT failures
Lighting & signalling was a recorded failure area in 8.2% of Mercedes-Benz B-Class MOT tests in this dataset. It is most prominent on 2006, 2010 cars.
Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair cost: £10–£150 (rough UK ballpark, not a quote).
Lighting & signalling failures by year
| Model year | Tests | Fail rate |
|---|---|---|
| 2005 | 3,546 | 14.0% |
| 2006 | 16,266 | 14.6% |
| 2007 | 20,165 | 13.6% |
| 2008 | 25,457 | 13.0% |
| 2009 | 30,409 | 12.9% |
| 2010 | 31,153 | 14.1% |
| 2011 | 23,983 | 14.1% |
Methodology & source. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.