Audi A4 vs Audi A6
On MOT-testable defects, the Audi A6 (fail rate 15.0%) performed better than the Audi A4 (18.9%) across comparable years. The biggest divergence was body, structure & corrosion, where the A4 recorded failures more often.
18.9%
A4 fail rate
15.0%
A6 fail rate
3.93pp
Difference
Side by side
| Metric | Audi A4 | Audi A6 |
|---|---|---|
| MOT tests analysed | 1,555,960 | 715,323 |
| Pass rate | 81.1% | 85.0% |
| Fail rate | 18.9% | 15.0% |
Where they differ
| Category | A4 | A6 |
|---|---|---|
| Body, structure & corrosion | 3.4% | 0.0% |
| Suspension | 7.6% | 4.8% |
| Emissions & environmental | 0.0% | 2.3% |
| Brakes | 4.7% | 2.7% |
| Lighting & signalling | 7.7% | 5.8% |
| Tyres | 6.4% | 6.2% |
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.