Audi A6 vs Audi Tt s-line quattro: 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 Tt s-line quattro
83%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Audi A6 (78%) and Audi Tt s-line quattro (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A6 | Audi Tt s-line quattro |
|---|---|---|
| MOT pass rate | 78% | 83% ✓ |
| MOT failure rate | 22% | 17% ✓ |
| Faults & advisories per test | 1.7 ✓ | 1.9 |
| Dangerous-fault share | 2% | 0% ✓ |
| Average mileage | 136,441 mi | 102,912 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 Tt s-line quattro
- Front Inner Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Rear Inner Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Engine covers And Undertrays fitted obscuring some components
- 245/35R19 CONTINENTAL CONTI SPORT CONTACT 3* EXTRA LOAD ALROUND
- Nearside Front Tyre worn close to the legal limit 2.49 mm (4.1.E.1)
- Nearside Headlamp aim too high (1.8)
Reliability FAQ
On MOT pass rate the Audi A6 (78%) and Audi Tt s-line quattro (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A6 report Full Audi Tt s-line quattro 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.