Mercedes-Benz Ml: lighting & signalling MOT failures
Lighting & signalling was a recorded failure area in 10.9% of Mercedes-Benz Ml MOT tests in this dataset. It is most prominent on 2003, 2004 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 |
|---|---|---|
| 2003 | 8,456 | 20.3% |
| 2004 | 11,218 | 19.6% |
| 2005 | 7,960 | 17.0% |
| 2011 | 16,429 | 9.3% |
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.