Audi A4 vs Audi Tt quattro tdi: 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 Tt quattro tdi
85%
MOT pass rate · 159 vehicles
More reliable
Verdict: On MOT pass rate, the Audi Tt quattro tdi is the more reliable of the two — 85% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A4 | Audi Tt quattro tdi |
|---|---|---|
| MOT pass rate | 76% | 85% ✓ |
| MOT failure rate | 24% | 15% ✓ |
| Faults & advisories per test | 1.9 | 0.0 ✓ |
| Dangerous-fault share | 2% | — ✓ |
| Average mileage | 133,841 mi | 130,236 mi |
| Sample size (vehicles) | 568,515 | 159 |
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 Tt quattro tdi
No fault breakdown available.
Reliability FAQ
On MOT pass rate, the Audi Tt quattro tdi is the more reliable of the two — 85% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Full Audi A4 report Full Audi Tt 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.