Audi A4 vs Audi A6 tdi le: 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 tdi le
80%
MOT pass rate · 73 vehicles
More reliable
Verdict: On MOT pass rate, the Audi A6 tdi le is the more reliable of the two — 80% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A4 | Audi A6 tdi le |
|---|---|---|
| MOT pass rate | 76% | 80% ✓ |
| MOT failure rate | 24% | 20% ✓ |
| Faults & advisories per test | 1.9 | 0.0 ✓ |
| Dangerous-fault share | 2% | — ✓ |
| Average mileage | 133,841 mi | 181,617 mi |
| Sample size (vehicles) | 568,515 | 73 |
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 tdi le
No fault breakdown available.
Reliability FAQ
On MOT pass rate, the Audi A6 tdi le is the more reliable of the two — 80% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Full Audi A4 report Full Audi A6 tdi le 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.