Audi A4 vs Audi A6
On MOT-testable defects the Audi A6 comes out ahead: 14.7% of its tests record a failure against 18.7% for the Audi A4, a 4.0-point gap. The biggest single difference is body, structure & corrosion, where the A4 records failures noticeably more often.
18.7%
A4 fail rate
14.7%
A6 fail rate
3.98pp
Difference
Side by side
| Metric | Audi A4 | Audi A6 |
|---|---|---|
| MOT tests analysed | 1,591,058 | 739,365 |
| Pass rate | 81.3% | 85.3% |
| Fail rate | 18.7% | 14.7% |
Where they differ
| Category | A4 | A6 |
|---|---|---|
| Body, structure & corrosion | 3.3% | 0.0% |
| Suspension | 7.5% | 4.7% |
| Emissions & environmental | 0.0% | 2.3% |
| Lighting & signalling | 7.6% | 5.6% |
| Brakes | 4.6% | 2.7% |
| Tyres | 6.4% | 6.2% |
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.