Diesel Fiat 500l: MOT pass rate
68.7% of diesel Fiat 500ls pass the MOT first time, measured across 11,925 DVSA tests on that fuel type alone. Average mileage at test was 74,465.
Diesel against the other Fiat 500l versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Diesel | 68.7% | 11,925 |
| Petrol | 73.7% | 5,515 |
| All Fiat 500l | 70.3% | 17,443 |
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 500l specifically, petrol is the strongest at 73.7%, and this diesel version sits 1.6 points below the 70.3% model average.
What it means if you are buying one
The diesel Fiat 500l 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 500l had covered 74,465 miles at test, against 57,023 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 500l page separate age from fuel if you want to isolate one.
Other Fiat 500l fuel types
- Petrol Fiat 500l - 73.7%