High-confidence used car comparison
BMW 3 Series vs Audi A4: reliability and MOT problems
BMW 3 Series has the lower MOT failure rate in this comparison: 18.6% versus 18.8% for the Audi A4, based on 815,286 combined UK MOT tests. A difference of 0.2% is useful as a signal, but the exact car's MOT history and repair evidence still matter most.
Statistics are built from DVSA MOT tests carried out in calendar year 2023, plus official recall records and MOT fault wording data. Report index generated 2026-05-09.
| Model | MOT failure rate | Tests | Vehicles | Median tested mileage |
|---|---|---|---|---|
| BMW 3 Series | 18.6% | 495,173 tests | 392,827 vehicles | 102,932 miles |
| Audi A4 | 18.8% | 320,113 tests | 251,873 vehicles | 101,704 miles |
Best starting point
BMW 3 Series has the lower recorded MOT failure rate in this pair.
Check before buying
Open both model reports and compare repeat advisories, mileage-band failure rates, recalls, tyres, brakes, suspension, warning lights, and corrosion history.