Diesel Fiat 500x: MOT pass rate
74.3% of diesel Fiat 500x pass the MOT first time, measured across 10,766 DVSA tests on that fuel type alone. Average mileage at test was 65,152.
Diesel against the other Fiat 500x versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Petrol | 82.1% | 23,290 |
| Diesel | 74.3% | 10,766 |
| All Fiat 500x | 79.6% | 34,056 |
Why the fuel type changes the number
Diesels carry DPFs, EGR valves and stricter smoke limits, so emissions and exhaust faults account for failures petrol cars never see.
On the Fiat 500x specifically, petrol is the strongest at 82.1%, and this diesel version sits 5.3 points below the 79.6% model average.
What it means if you are buying one
The diesel Fiat 500x fails more often than the model average, so budget for the items that catch this fuel type and treat a fresh MOT as worth paying for. Check the exact car, decode the VIN and check the mileage before you bid.
Mileage is part of the answer
The average diesel Fiat 500x had covered 65,152 miles at test, against 47,799 for the petrol. That is a shade above the middle of the range, still ordinary wear rather than a red flag, but worth checking against the service book for the car's age.
Fuel type and mileage are tangled together: diesels are usually bought by higher-mileage drivers, so some of any gap between fuels is the miles rather than the engine. The per-year figures on the Fiat 500x page separate age from fuel if you want to isolate one.
Other Fiat 500x fuel types
- Petrol Fiat 500x - 82.1%