Diesel Alfa Romeo Spider: MOT pass rate
68.2% of diesel Alfa Romeo Spiders pass the MOT first time, measured across 233 DVSA tests on that fuel type alone. Average mileage at test was 87,487.
Diesel against the other Alfa Romeo Spider versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Petrol | 73.9% | 3,018 |
| Diesel | 68.2% | 233 |
| All Alfa Romeo Spider | 73.5% | 3,252 |
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 Alfa Romeo Spider specifically, petrol is the strongest at 73.9%, and this diesel version sits 5.3 points below the 73.5% model average.
What it means if you are buying one
The diesel Alfa Romeo Spider 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 Alfa Romeo Spider had covered 87,487 miles at test, against 76,171 for the petrol. That is above average, the point where suspension bushes, drop links and exhaust corrosion start showing up as advisories before they become failures.
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 Alfa Romeo Spider page separate age from fuel if you want to isolate one.
Other Alfa Romeo Spider fuel types
- Petrol Alfa Romeo Spider - 73.9%