Audi A1 vs Audi A4 se ultra tdi: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A1
84%
MOT pass rate · 235,482 vehicles
Audi A4 se ultra tdi
92%
MOT pass rate · 533 vehicles
More reliable
Verdict: On MOT pass rate, the Audi A4 se ultra tdi is the more reliable of the two — 92% pass first time versus 84%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A1 | Audi A4 se ultra tdi |
|---|---|---|
| MOT pass rate | 84% | 92% ✓ |
| MOT failure rate | 16% | 8% ✓ |
| Faults & advisories per test | 1.5 | 0.0 ✓ |
| Dangerous-fault share | 5% | — ✓ |
| Average mileage | 67,791 mi | 102,536 mi |
| Sample size (vehicles) | 235,482 | 533 |
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 se ultra tdi
No fault breakdown available.
Reliability FAQ
On MOT pass rate, the Audi A4 se ultra tdi is the more reliable of the two — 92% pass first time versus 84%. It's one signal among several; check the full breakdown below.
Full Audi A1 report Full Audi A4 se ultra 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.