Audi Tt vs Porsche Boxster
On MOT-testable defects, the Porsche Boxster (fail rate 13.8%) performed better than the Audi Tt (17.4%) across comparable years. The biggest divergence was suspension, where the Tt recorded failures more often.
17.4%
Tt fail rate
13.8%
Boxster fail rate
3.62pp
Difference
Side by side
| Metric | Audi Tt | Porsche Boxster |
|---|---|---|
| MOT tests analysed | 674,605 | 182,460 |
| Pass rate | 82.6% | 86.2% |
| Fail rate | 17.4% | 13.8% |
Where they differ
| Category | Tt | Boxster |
|---|---|---|
| Suspension | 6.4% | 3.8% |
| Tyres | 5.1% | 2.7% |
| Lighting & signalling | 7.3% | 6.1% |
| Brakes | 4.8% | 3.6% |
| Emissions & environmental | 3.3% | 3.9% |
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.