Fiat 500 vs Fiat Uno formula: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Fiat 500
77%
MOT pass rate · 333,596 vehicles
More reliable
Fiat Uno formula
63%
MOT pass rate · 36,981 vehicles
Verdict: On MOT pass rate, the Fiat 500 is the more reliable of the two — 77% pass first time versus 63%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Fiat 500 | Fiat Uno formula |
|---|---|---|
| MOT pass rate | 77% ✓ | 63% |
| MOT failure rate | 23% ✓ | 37% |
| Faults & advisories per test | 2.0 ✓ | 2.1 |
| Dangerous-fault share | 3% | 0% ✓ |
| Average mileage | 62,906 mi | 60,312 mi |
| Sample size (vehicles) | 333,596 | 36,981 |
Most common faults
Fiat 500
- 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))
- Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
- Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
- Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
- Nearside Rear Coil spring corroded (5.3.1 (b) (i))
Fiat Uno formula
- Parking brake: efficiency below requirements (3.7.B.7)
- Nearside Rear Suspension component mounting prescribed area is excessively corroded (2.4.A.3)
- Offside Rear Suspension component mounting prescribed area is excessively corroded (2.4.A.3)
- Exhaust emissions carbon monoxide content excessive (7.3.B.1a)
- Front Exhaust has a minor leak of exhaust gases (7.1.2)
- Service brake: efficiency below requirements (3.7.B.7)
Reliability FAQ
On MOT pass rate, the Fiat 500 is the more reliable of the two — 77% pass first time versus 63%. It's one signal among several; check the full breakdown below.
Full Fiat 500 report Full Fiat Uno formula 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.