Audi A4 vs Audi A6 sline sp ed tdi quat a: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A4
76%
MOT pass rate · 568,515 vehicles
Audi A6 sline sp ed tdi quat a
86%
MOT pass rate · 29 vehicles
Verdict: On MOT pass rate the Audi A4 (76%) and Audi A6 sline sp ed tdi quat a (86%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A4 | Audi A6 sline sp ed tdi quat a |
|---|---|---|
| MOT pass rate | 76% | 86% ✓ |
| MOT failure rate | 24% | 14% ✓ |
| Faults & advisories per test | 1.9 | 0.0 ✓ |
| Dangerous-fault share | 2% | — ✓ |
| Average mileage | 133,841 mi | 221,416 mi |
| Sample size (vehicles) | 568,515 | 29 |
Most common faults
Audi A4
- 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 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)
- Under-trays fitted obscuring some underside components
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Audi A6 sline sp ed tdi quat a
No fault breakdown available.
Reliability FAQ
On MOT pass rate the Audi A4 (76%) and Audi A6 sline sp ed tdi quat a (86%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A4 report Full Audi A6 sline sp ed tdi quat a 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.