Audi A1 vs Audi A4 tdi sport: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A1
84%
MOT pass rate · 235,482 vehicles
More reliable
Audi A4 tdi sport
71%
MOT pass rate · 1,184 vehicles
Verdict: On MOT pass rate, the Audi A1 is the more reliable of the two — 84% pass first time versus 71%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A1 | Audi A4 tdi sport |
|---|---|---|
| MOT pass rate | 84% ✓ | 71% |
| MOT failure rate | 16% ✓ | 29% |
| Faults & advisories per test | 1.5 | 0.0 ✓ |
| Dangerous-fault share | 5% | — ✓ |
| Average mileage | 67,791 mi | 205,420 mi |
| Sample size (vehicles) | 235,482 | 1,184 |
Most common faults
Audi A1
- 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))
- Rear Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
- Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Audi A4 tdi sport
No fault breakdown available.
Reliability FAQ
On MOT pass rate, the Audi A1 is the more reliable of the two — 84% pass first time versus 71%. It's one signal among several; check the full breakdown below.
Full Audi A1 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.