Audi TT: lighting & signalling MOT failures
Lighting & signalling was recorded as a failure area in 7.3% of Audi TT MOT tests — 49,087 tests out of 676,127. It shows up most on 1999 and 2001 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 | 2,652 | 16.6% |
| 2000 | 13,145 | 15.2% |
| 2001 | 20,723 | 16.1% |
| 2002 | 30,275 | 15.8% |
| 2003 | 33,763 | 15.3% |
| 2004 | 32,502 | 14.2% |
| 2005 | 24,742 | 13.9% |
| 2006 | 19,721 | 12.4% |
| 2007 | 50,786 | 10.2% |
| 2008 | 45,228 | 8.1% |
| 2009 | 37,072 | 6.9% |
| 2010 | 39,266 | 5.8% |
| 2011 | 37,943 | 4.3% |
| 2012 | 31,946 | 4.2% |
| 2013 | 35,604 | 3.9% |
| 2014 | 22,188 | 3.7% |
| 2015 | 47,815 | 2.8% |
| 2016 | 50,271 | 2.3% |
| 2017 | 40,126 | 1.9% |
| 2018 | 22,502 | 1.6% |
| 2019 | 19,858 | 1.3% |
| 2020 | 9,769 | 0.9% |
| 2021 | 5,269 | 1.2% |
| 2022 | 2,847 | 1.4% |
Methodology & source. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.