Mercedes-Benz A-Class vs Bmw 1 Series: Compare by Reg (2026)
Side-by-side comparison of the Mercedes-Benz A-Class and Bmw 1 Series, covering MOT pass rates, running costs, common faults, and overall reliability. Based on 674,755 real MOT tests.
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Quick Verdict
The Bmw 1 Series comes out slightly ahead with a 87% MOT pass rate versus 84% for the Mercedes-Benz A-Class. Both cars are competitive in this segment, but the Bmw 1 Series has a small edge on reliability. Consider test driving both before making your decision.
Mercedes-Benz A-Class
84%
MOT pass rate
493,299 tests
Bmw 1 Series
87%
MOT pass rate
181,456 tests
More reliableFull Comparison: Mercedes-Benz A-Class vs Bmw 1 Series
| Category | Mercedes-Benz A-Class | Bmw 1 Series |
|---|---|---|
| MOT Pass Rate | 84% | 87%Winner |
| MOT Fail Rate | 16% | 13%Winner |
| vs National Avg | +2 pts | +5 ptsWinner |
| Est. Fuel Cost (8,000 mi/yr) | £1,434 | £1,434 |
| Insurance Group | 10-20 | 25-35 |
| Est. Depreciation/yr | £1,200-£2,200 | £2,000-£3,500 |
| Engine Size | 1.7L | 2.1L |
| Fuel Type(s) | Petrol, Diesel | Petrol, Diesel |
| Segment | Family car | Premium |
| Avg Mileage | 74,077 miWinner | 88,631 mi |
| MOT Tests Analysed | 493,299 | 181,456 |
| Model Years | 24 years | 18 years |
| Best Year | 2021 (95%) | 2020 (99%)Winner |
| Worst Year | 1999 (68%) | 2004 (72%)Winner |
| Reliability Trend | Improving | Improving |
Common Problems Comparison
Mercedes-Benz A-Class Known Issues
- •DPF and emissions issues (diesel models)
- •Suspension wear on older models
- •Lighting defects (common on all cars)
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)
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Mercedes-Benz A-Class vs Bmw 1 Series FAQ
Which is more reliable, the Mercedes-Benz A-Class or Bmw 1 Series?
Based on MOT data, the Bmw 1 Series is more reliable with a 87% pass rate, compared to 84% for the Mercedes-Benz A-Class.
Which is cheaper to run?
At 8,000 miles per year, the Mercedes-Benz A-Class costs around £1,434 in fuel, while the Bmw 1 Series costs around £1,434. The Mercedes-Benz A-Class is cheaper on fuel. Insurance, depreciation, and repair costs also factor into total running costs.
Should I buy a Mercedes-Benz A-Class or Bmw 1 Series?
The Bmw 1 Series comes out slightly ahead with a 87% MOT pass rate versus 84% for the Mercedes-Benz A-Class. Both cars are competitive in this segment, but the Bmw 1 Series has a small edge on reliability. Consider test driving both before making your decision.
Mercedes-Benz A-Class Running Costs
Full breakdown of annual costs, reliability, and MOT data
Bmw 1 Series Running Costs
Full breakdown of annual costs, reliability, and MOT data
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