Audi A3 vs Audi S4 avant estate: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A3
78%
MOT pass rate · 586,036 vehicles
Audi S4 avant estate
92%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Audi A3 (78%) and Audi S4 avant estate (92%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A3 | Audi S4 avant estate |
|---|---|---|
| MOT pass rate | 78% | 92% ✓ |
| MOT failure rate | 22% | 8% ✓ |
| Faults & advisories per test | 1.8 | 0.8 ✓ |
| Dangerous-fault share | 3% | 0% ✓ |
| Average mileage | 112,882 mi | 93,815 mi |
| Sample size (vehicles) | 586,036 | 1 |
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 S4 avant estate
- Offside Front Coil spring corroded (5.3.1 (b) (i))
- Front registration plate character(s) incorrectly spaced (6.3.4a)
- Nearside Front Tyre not fitted in accordance with side wall instructions (4.1.D.1f)
- Nearside Headlamp aim too high (1.8)
- Offside Headlamp aim too low (1.8)
- Offside registration plate character(s) incorrectly spaced (6.3.4a)
Reliability FAQ
On MOT pass rate the Audi A3 (78%) and Audi S4 avant estate (92%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A3 report Full Audi S4 avant estate 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.