Diesel Audi A4: MOT pass rate
75% of diesel Audi A4s pass the MOT first time, measured across 165,081 DVSA tests on that fuel type alone. Average mileage at test was 121,863.
Diesel against the other Audi A4 versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Diesel | 75% | 165,081 |
| Petrol | 80.6% | 79,295 |
| All Audi A4 | 76.8% | 244,401 |
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 Audi A4 specifically, petrol is the strongest at 80.6%, and this diesel version sits 1.8 points below the 76.8% model average.
What it means if you are buying one
The diesel Audi A4 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 Audi A4 had covered 121,863 miles at test, against 80,740 for the petrol. That is high mileage, so timing belts, clutches, suspension bushes and corrosion are the items worth budgeting for rather than the MOT itself.
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 Audi A4 page separate age from fuel if you want to isolate one.
Other Audi A4 fuel types
- Petrol Audi A4 - 80.6%