Audi TT vs BMW 4 Series
On MOT-testable defects the BMW 4 Series comes out ahead: 11.8% of its tests record a failure against 17.4% for the Audi TT, a 5.7-point gap. The biggest single difference is suspension, where the TT records failures noticeably more often.
17.4%
TT fail rate
11.8%
4 Series fail rate
5.66pp
Difference
Side by side
| Metric | Audi TT | BMW 4 Series |
|---|---|---|
| MOT tests analysed | 676,127 | 567,497 |
| Pass rate | 82.6% | 88.2% |
| Fail rate | 17.4% | 11.8% |
Where they differ
| Category | TT | 4 Series |
|---|---|---|
| Suspension | 6.4% | 1.4% |
| Lighting & signalling | 7.3% | 2.4% |
| Emissions & environmental | 3.3% | 0.0% |
| Brakes | 4.8% | 1.9% |
| Tyres | 5.1% | 7.3% |
| Visibility | 0.0% | 1.6% |
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.