Audi A4 vs Audi Tt sport tdi quattro auto: 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 sport tdi quattro auto
95%
MOT pass rate · 12 vehicles
Verdict: On MOT pass rate the Audi A4 (76%) and Audi Tt sport tdi quattro auto (95%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A4 | Audi Tt sport tdi quattro auto |
|---|---|---|
| MOT pass rate | 76% | 95% ✓ |
| MOT failure rate | 24% | 5% ✓ |
| Faults & advisories per test | 1.9 | 0.0 ✓ |
| Dangerous-fault share | 2% | — ✓ |
| Average mileage | 133,841 mi | 73,911 mi |
| Sample size (vehicles) | 568,515 | 12 |
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 sport tdi quattro auto
No fault breakdown available.
Reliability FAQ
On MOT pass rate the Audi A4 (76%) and Audi Tt sport tdi quattro auto (95%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A4 report Full Audi Tt sport tdi quattro auto 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.