Bmw 1 Series vs Audi A3: Compare by Reg (2026)
Side-by-side comparison of the Bmw 1 Series and Audi A3, covering MOT pass rates, running costs, common faults, and overall reliability. Based on 965,744 real MOT tests.
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Quick Verdict
The Bmw 1 Series edges ahead in this comparison with a 87% MOT pass rate versus 84% for the Audi A3. The difference is modest, so both are reasonable choices. The Bmw 1 Series has a slight reliability advantage, while the Audi A3 may offer other benefits depending on your priorities.
Bmw 1 Series
87%
MOT pass rate
181,456 tests
More reliableAudi A3
84%
MOT pass rate
784,288 tests
Full Comparison: Bmw 1 Series vs Audi A3
| Category | Bmw 1 Series | Audi A3 |
|---|---|---|
| MOT Pass Rate | 87%Winner | 84% |
| MOT Fail Rate | 13%Winner | 16% |
| vs National Avg | +5 ptsWinner | +2 pts |
| Est. Fuel Cost (8,000 mi/yr) | £1,434 | £1,434 |
| Insurance Group | 25-35 | 18-28 |
| Est. Depreciation/yr | £2,000-£3,500 | £2,000-£3,500 |
| Engine Size | 2.1L | 1.7L |
| Fuel Type(s) | Petrol, Diesel | Petrol, Diesel |
| Segment | Premium | Premium |
| Avg Mileage | 88,631 miWinner | 104,648 mi |
| MOT Tests Analysed | 181,456 | 784,288 |
| Model Years | 18 years | 25 years |
| Best Year | 2020 (99%)Winner | 2021 (94%) |
| Worst Year | 2004 (72%)Winner | 1997 (68%) |
| Reliability Trend | Improving | Improving |
Common Problems Comparison
Bmw 1 Series Known Issues
- •DPF and emissions issues (diesel models)
- •Higher tyre and brake wear (larger engine)
- •Suspension wear on older models
- •Lighting defects (common on all cars)
Audi A3 Known Issues
- •DPF and emissions issues (diesel models)
- •Suspension wear on older models
- •Lighting defects (common on all cars)
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Bmw 1 Series vs Audi A3 FAQ
Which is more reliable, the Bmw 1 Series or Audi A3?
Based on MOT data, the Bmw 1 Series is more reliable with a 87% pass rate, compared to 84% for the Audi A3.
Which is cheaper to run?
At 8,000 miles per year, the Bmw 1 Series costs around £1,434 in fuel, while the Audi A3 costs around £1,434. The Bmw 1 Series is cheaper on fuel. Insurance, depreciation, and repair costs also factor into total running costs.
Should I buy a Bmw 1 Series or Audi A3?
The Bmw 1 Series edges ahead in this comparison with a 87% MOT pass rate versus 84% for the Audi A3. The difference is modest, so both are reasonable choices. The Bmw 1 Series has a slight reliability advantage, while the Audi A3 may offer other benefits depending on your priorities.
Bmw 1 Series Running Costs
Full breakdown of annual costs, reliability, and MOT data
Audi A3 Running Costs
Full breakdown of annual costs, reliability, and MOT data
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