Audi A1 vs Audi Audi a4 1.9 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 Audi a4 1.9 tdi
67%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Audi A1 (84%) and Audi Audi a4 1.9 tdi (67%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A1 | Audi Audi a4 1.9 tdi |
|---|---|---|
| MOT pass rate | 84% ✓ | 67% |
| MOT failure rate | 16% ✓ | 33% |
| Faults & advisories per test | 1.5 ✓ | 3.3 |
| Dangerous-fault share | 5% | 0% ✓ |
| Average mileage | 67,791 mi | 151,696 mi |
| Sample size (vehicles) | 235,482 | 1 |
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 Audi a4 1.9 tdi
- Nearside Front Track rod end ball joint has slight play (2.2.B.1f)
- Front Windscreen washer provides insufficient washer liquid (8.2.3)
- Front registration plate deteriorated (6.3.1d)
- Nearside Front Windscreen wiper blade deteriorated (8.2.2)
- Nearside Rear Brake pipe inadequately supported (3.6.B.1)
- Nearside Rear Tyre has a cut in excess of the requirements deep enough to reach the ply or cords (4.1.D.1a)
Reliability FAQ
On MOT pass rate the Audi A1 (84%) and Audi Audi a4 1.9 tdi (67%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A1 report Full Audi Audi a4 1.9 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.