Audi A4: lighting & signalling MOT failures
Lighting & signalling was a recorded failure area in 7.7% of Audi A4 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 |
|---|---|---|
| 1999 | 5,746 | 12.0% |
| 2000 | 7,538 | 10.7% |
| 2001 | 8,024 | 13.8% |
| 2002 | 18,454 | 15.6% |
| 2003 | 33,812 | 16.1% |
| 2004 | 54,779 | 16.0% |
| 2005 | 62,674 | 14.3% |
| 2006 | 96,819 | 13.2% |
| 2007 | 108,951 | 12.8% |
| 2011 | 86,194 | 8.2% |
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.