Diesel Peugeot 508: MOT pass rate

75.3% of diesel Peugeot 508s pass the MOT first time, measured across 15,859 DVSA tests on that fuel type alone. Average mileage at test was 101,356.

Diesel against the other Peugeot 508 versions

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 Peugeot 508 specifically, petrol is the strongest at 84.3%, and this diesel version sits 0.6 points below the 75.9% model average.

What it means if you are buying one

There is little to choose between fuel types on this model, so decide on running costs and mileage rather than MOT record. Buying a damaged one? run it through the analyzer, check the exact car, decode the VIN and check the mileage before you bid.

Mileage is part of the answer

The average diesel Peugeot 508 had covered 101,356 miles at test, against 40,891 for the petrol. That is above average and into the range where cambelts and water pumps are due if they have not already been done, so ask for the service history rather than take the mileage on trust.

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 Peugeot 508 page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Peugeot 508

1. Lamp emitted colour, position or intensity not in accordance with the requirements, 1.4% of tests (2.38x the national rate for this defect)
2. A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps, 2.1% of tests (2.37x the national rate for this defect)
3. Brake disc or drum significantly and obviously worn, 1.5% of tests (1.85x the national rate for this defect)
4. A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc, 2.7% of tests (1.77x the national rate for this defect)
5. Tyre tread depth not in accordance with the requirements, 5.4% of tests (1.7x the national rate for this defect)
6. A spring or spring component fractured or seriously weakened, 3.9% of tests (1.7x the national rate for this defect)
7. a brake lining or pad worn below 1.5mm, 3.6% of tests (1.65x the national rate for this defect)
8. A tyre cords visible or damaged, 2.3% of tests (1.35x the national rate for this defect)
9. A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED, 1.6% of tests (1.3x the national rate for this defect)
10. A suspension pin, bush or joint excessively worn, 5.2% of tests

From 15,937 DVSA-tracked diesel Peugeot 508 tests, 2024, split out from the Peugeot 508's other fuel types. DVSA testers marked 6.91% of these flagged defects as "dangerous", against 5.11% nationally. See which fuel type fails on the most dangerous defects nationally for how that compares across the whole fleet.

Most common MOT advisories on a diesel Peugeot 508

Flagged but doesn't fail the car, a different list from the failures above.

1. Lamp emitted colour, position or intensity not in accordance with the requirements, 4.5% of tests (3.25x the national rate for this defect), also fails
2. Brake disc or drum significantly and obviously worn, 4.8% of tests (1.5x the national rate for this defect), also fails
3. Brake disc or drum excessively weakened, insecure or fractured, 18.1% of tests (1.48x the national rate for this defect)
4. a brake lining or pad worn below 1.5mm, 13.7% of tests (1.47x the national rate for this defect), also fails
5. Excessive fluctuation in brake effort through each wheel revolution., 1.2% of tests (1.43x the national rate for this defect)
6. Tyre tread depth not in accordance with the requirements, 34.7% of tests (1.3x the national rate for this defect), also fails
7. A suspension pin, bush or joint excessively worn, 17.3% of tests (1.3x the national rate for this defect), also fails
8. Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, 6.6% of tests (1.18x the national rate for this defect)
9. A tyre seriously damaged, 10.8% of tests
10. A shock absorber damaged to the extent that it does not function or showing signs of severe leakage, 2.4% of tests

From 15,937 DVSA-tracked diesel Peugeot 508 tests, 2024.

Other Peugeot 508 fuel types

• Petrol Peugeot 508 - 84.3%

All Peugeot 508 MOT data · Every model