Audi A6 vs Audi Q7 s line quattro tdi: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A6
78%
MOT pass rate · 246,602 vehicles
More reliable
Audi Q7 s line quattro tdi
74%
MOT pass rate · 428 vehicles
Verdict: On MOT pass rate, the Audi A6 is the more reliable of the two — 78% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A6 | Audi Q7 s line quattro tdi |
|---|---|---|
| MOT pass rate | 78% ✓ | 74% |
| MOT failure rate | 22% ✓ | 26% |
| Faults & advisories per test | 1.7 | 0.0 ✓ |
| Dangerous-fault share | 2% | 0% ✓ |
| Average mileage | 136,441 mi | 162,705 mi |
| Sample size (vehicles) | 246,602 | 428 |
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 Q7 s line quattro tdi
- Front brake disc worn, pitted or scored, but not seriously weakened (3.5.1i)
- Nail in offside rear tyre
- Front Brake pad(s) wearing thin (3.5.1g)
- Rear Brake pad(s) wearing thin (3.5.1g)
- small tear on n/s/r tyre wall
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
Reliability FAQ
On MOT pass rate, the Audi A6 is the more reliable of the two — 78% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Full Audi A6 report Full Audi Q7 s line quattro tdi 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.