Audi A3 sline vs Audi A4: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A3 sline
75%
MOT pass rate · 1 vehicles
Audi A4
76%
MOT pass rate · 568,515 vehicles
Verdict: On MOT pass rate the Audi A3 sline (75%) and Audi A4 (76%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Audi A3 sline | Audi A4 |
|---|---|---|
| MOT pass rate | 75% | 76% ✓ |
| MOT failure rate | 25% | 24% ✓ |
| Faults & advisories per test | 1.5 ✓ | 1.9 |
| Dangerous-fault share | 17% | 2% ✓ |
| Average mileage | 174,131 mi | 133,841 mi |
| Sample size (vehicles) | 1 | 568,515 |
Most common faults
Audi A3 sline
- Offside Front Suspension arm pin or bush worn but not resulting in excessive movement (5.3.4 (a) (i))
- Tyre has a cut but not deep enough to reach the ply or cords all 4 (5.2.3 (d) (i))
- Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Nearside Front Suspension arm pin or bush excessively worn (5.3.4 (a) (i))
- Nearside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))
Audi A4
- 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)
- Under-trays fitted obscuring some underside components
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Audi A3 sline (75%) and Audi A4 (76%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Audi A3 sline report Full Audi A4 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.