Ford Fiesta vs Mercedes C: Compare by Reg (2026)
Side-by-side comparison of the Ford Fiesta and Mercedes C, covering MOT pass rates, running costs, common faults, and overall reliability. Based on 3,260,519 real MOT tests.
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Quick Verdict
The Mercedes C is the clear winner here, with a 84% MOT pass rate compared to 78% for the Ford Fiesta. You are less likely to face unexpected repair bills with the Mercedes C, making it the more reliable and cost-effective choice overall.
Ford Fiesta
78%
MOT pass rate
2,484,327 tests
Mercedes C
84%
MOT pass rate
776,192 tests
More reliableFull Comparison: Ford Fiesta vs Mercedes C
| Category | Ford Fiesta | Mercedes C |
|---|---|---|
| MOT Pass Rate | 78% | 84%Winner |
| MOT Fail Rate | 22% | 16%Winner |
| vs National Avg | -4 pts | +2 ptsWinner |
| Est. Fuel Cost (8,000 mi/yr) | £1,195 | £1,115Winner |
| Insurance Group | 6-15 | 15-25 |
| Est. Depreciation/yr | £1,200-£2,200 | £1,500-£3,000 |
| Engine Size | 1.3L | 2.2L |
| Fuel Type(s) | Petrol, Diesel | Hybrid, Petrol, Diesel |
| Segment | Small family car | Family car |
| Avg Mileage | 66,345 miWinner | 97,926 mi |
| MOT Tests Analysed | 2,484,327 | 776,192 |
| Model Years | 33 years | 32 years |
| Best Year | 2021 (94%)Winner | 2020 (92%) |
| Worst Year | 1998 (65%) | 2004 (72%)Winner |
| Reliability Trend | Improving | Improving |
Common Problems Comparison
Ford Fiesta Known Issues
- •DPF and emissions issues (diesel models)
- •Suspension wear on older models
- •Lighting defects (common on all cars)
Mercedes C 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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Ford Fiesta vs Mercedes C FAQ
Which is more reliable, the Ford Fiesta or Mercedes C?
Based on MOT data, the Mercedes C is more reliable with a 84% pass rate, compared to 78% for the Ford Fiesta.
Which is cheaper to run?
At 8,000 miles per year, the Ford Fiesta costs around £1,195 in fuel, while the Mercedes C costs around £1,115. The Mercedes C is cheaper on fuel. Insurance, depreciation, and repair costs also factor into total running costs.
Should I buy a Ford Fiesta or Mercedes C?
The Mercedes C is the clear winner here, with a 84% MOT pass rate compared to 78% for the Ford Fiesta. You are less likely to face unexpected repair bills with the Mercedes C, making it the more reliable and cost-effective choice overall.
Ford Fiesta Running Costs
Full breakdown of annual costs, reliability, and MOT data
Mercedes C Running Costs
Full breakdown of annual costs, reliability, and MOT data
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