Audi A3 vs Audi A4 tdi sport: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A3
78%
MOT pass rate · 586,036 vehicles
More reliable
Audi A4 tdi sport
71%
MOT pass rate · 1,184 vehicles
Verdict: On MOT pass rate, the Audi A3 is the more reliable of the two — 78% pass first time versus 71%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A3 | Audi A4 tdi sport |
|---|---|---|
| MOT pass rate | 78% ✓ | 71% |
| MOT failure rate | 22% ✓ | 29% |
| Faults & advisories per test | 1.8 | 0.0 ✓ |
| Dangerous-fault share | 3% | — ✓ |
| Average mileage | 112,882 mi | 205,420 mi |
| Sample size (vehicles) | 586,036 | 1,184 |
Most common faults
Audi A3
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- 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)
Audi A4 tdi sport
No fault breakdown available.
Reliability FAQ
On MOT pass rate, the Audi A3 is the more reliable of the two — 78% pass first time versus 71%. It's one signal among several; check the full breakdown below.
Full Audi A3 report Full Audi A4 tdi sport 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.