Audi A3 s line tdi quattro s-a vs Audi A4: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Audi A3 s line tdi quattro s-a
93%
MOT pass rate · 72 vehicles
More reliable
Audi A4
76%
MOT pass rate · 568,515 vehicles
Verdict: On MOT pass rate, the Audi A3 s line tdi quattro s-a is the more reliable of the two — 93% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Audi A3 s line tdi quattro s-a | Audi A4 |
|---|---|---|
| MOT pass rate | 93% ✓ | 76% |
| MOT failure rate | 7% ✓ | 24% |
| Faults & advisories per test | 0.0 ✓ | 1.9 |
| Dangerous-fault share | — ✓ | 2% |
| Average mileage | 96,064 mi | 133,841 mi |
| Sample size (vehicles) | 72 | 568,515 |
Most common faults
Audi A3 s line tdi quattro s-a
No fault breakdown available.
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 s line tdi quattro s-a is the more reliable of the two — 93% pass first time versus 76%. It's one signal among several; check the full breakdown below.
Full Audi A3 s line tdi quattro s-a 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.