Ford Fiesta vs Ford Mustung: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Ford Fiesta
73%
MOT pass rate · 2,835,744 vehicles
Ford Mustung
86%
MOT pass rate · 4 vehicles
Verdict: On MOT pass rate the Ford Fiesta (73%) and Ford Mustung (86%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Ford Fiesta | Ford Mustung |
|---|---|---|
| MOT pass rate | 73% | 86% ✓ |
| MOT failure rate | 27% | 14% ✓ |
| Faults & advisories per test | 2.1 | 1.0 ✓ |
| Dangerous-fault share | 2% ✓ | 3% |
| Average mileage | 84,529 mi | 83,871 mi |
| Sample size (vehicles) | 2,835,744 | 4 |
Most common faults
Ford Fiesta
- 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)
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Brake pipe slightly corroded (3.6.B.2c)
Ford Mustung
- Nearside Ball joint dust cover deteriorated, but preventing the ingress of dirt inner and outer joints (2.2.C.1c)
- Offside Front wheel bearing has slight play (2.5.A.3c)
- Front Outer Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings sill panels both sides (6.1.B.2)
- Rear Brakes imbalanced across an axle 36% (3.7.B.5b)
- Under-trays fitted obscuring some underside components
- Nearside Front Trailing arm rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)
Reliability FAQ
On MOT pass rate the Ford Fiesta (73%) and Ford Mustung (86%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Ford Fiesta report Full Ford Mustung 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.