Ford Fiesta st vs Ford Mondeo: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Ford Fiesta st
77%
MOT pass rate · 636 vehicles
More reliable
Ford Mondeo
70%
MOT pass rate · 1,212,823 vehicles
Verdict: On MOT pass rate, the Ford Fiesta st is the more reliable of the two — 77% pass first time versus 70%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Ford Fiesta st | Ford Mondeo |
|---|---|---|
| MOT pass rate | 77% ✓ | 70% |
| MOT failure rate | 23% ✓ | 30% |
| Faults & advisories per test | 0.7 ✓ | 2.2 |
| Dangerous-fault share | 4% | 1% ✓ |
| Average mileage | 96,165 mi | 130,467 mi |
| Sample size (vehicles) | 636 | 1,212,823 |
Most common faults
Ford Fiesta st
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Rear Coil spring corroded (5.3.1 (b) (i))
- Nearside Rear Coil spring corroded (5.3.1 (b) (i))
- Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
Ford Mondeo
- 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)
- Parking brake: efficiency below requirements (3.7.B.7)
- Front Brake pad(s) wearing thin (3.5.1g)
Reliability FAQ
On MOT pass rate, the Ford Fiesta st is the more reliable of the two — 77% pass first time versus 70%. It's one signal among several; check the full breakdown below.
Full Ford Fiesta st report Full Ford Mondeo 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.