Audi A6 vs Audi S line quattro fsi: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A6
78%
MOT pass rate · 246,602 vehicles
Audi S line quattro fsi
70%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Audi A6 (78%) and Audi S line quattro fsi (70%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A6 | Audi S line quattro fsi |
|---|---|---|
| MOT pass rate | 78% ✓ | 70% |
| MOT failure rate | 22% ✓ | 30% |
| Faults & advisories per test | 1.7 ✓ | 3.4 |
| Dangerous-fault share | 2% ✓ | 10% |
| Average mileage | 136,441 mi | 98,673 mi |
| Sample size (vehicles) | 246,602 | 1 |
Most common faults
Audi A6
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
Audi S line quattro fsi
- Front brake disc worn, pitted or scored, but not seriously weakened corroded (3.5.1i)
- Front Registration plate deteriorated but not likely to be misread (0.1 (b))
- engine oil level low
- Offside Front Inner Tyre worn close to legal limit/worn on edge edge worn (5.2.3 (e))
- Rear Brake disc worn, pitted or scored, but not seriously weakened corroded (1.1.14 (a) (ii))
- Rear Registration plate deteriorated but not likely to be misread (0.1 (b))
Reliability FAQ
On MOT pass rate the Audi A6 (78%) and Audi S line quattro fsi (70%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A6 report Full Audi S line quattro fsi report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.