Diesel Audi Tt: MOT pass rate

80.9% of diesel Audi Tts pass the MOT first time, measured across 19,118 DVSA tests on that fuel type alone. Average mileage at test was 90,923.

Diesel against the other Audi Tt 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 Audi Tt specifically, diesel is the strongest at 80.9%, and this diesel version sits 1.6 points above the 79.3% model average.

What it means if you are buying one

The diesel Audi Tt is the stronger side of this model on MOT data. Still judge the individual car, but the fuel type is a mild point in its favour. 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 Audi Tt had covered 90,923 miles at test, against 79,059 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 Audi Tt page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Audi Tt

1. Significant brake effort recorded with no brake applied indicating a binding brake, 1.4% of tests (1.39x the national rate for this defect)
2. Tyre tread depth not in accordance with the requirements, 4.4% of tests (1.38x the national rate for this defect)
3. A shock absorber damaged to the extent that it does not function or showing signs of severe leakage, 1.3% of tests (1.37x the national rate for this defect)
4. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 2.4% of tests (1.3x the national rate for this defect)
5. A tyre cords visible or damaged, 2.1% of tests (1.24x the national rate for this defect)
6. A tyre seriously damaged, 2.5% of tests
7. A spring or spring component fractured or seriously weakened, 2.2% of tests
8. a brake lining or pad worn below 1.5mm, 1.7% of tests
9. Wiper blade missing or obviously not clearing the windscreen, 1.3% of tests
10. Engine MIL illuminated indicating a malfunction, 1.2% of tests

From 19,246 DVSA-tracked diesel Audi Tt tests, 2024, split out from the Audi Tt's other fuel types. DVSA testers marked 6.71% 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 Audi Tt

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

1. A suspension component excessively damaged or corroded, 12.1% of tests (2.34x the national rate for this defect)
2. Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 0.7% of tests (1.99x the national rate for this defect)
3. Tyre tread depth not in accordance with the requirements, 32.1% of tests (1.2x the national rate for this defect), also fails
4. A shock absorber damaged to the extent that it does not function or showing signs of severe leakage, 4.7% of tests (1.19x the national rate for this defect), also fails
5. Brake disc or drum excessively weakened, insecure or fractured, 14.3% of tests (1.17x the national rate for this defect)
6. A spring or spring component fractured or seriously weakened, 5.5% of tests (1.16x the national rate for this defect), also fails
7. A tyre seriously damaged, 13.5% of tests, also fails
8. a brake lining or pad worn below 1.5mm, 8.1% of tests, also fails
9. A suspension pin, bush or joint excessively worn, 4.5% of tests
10. Brake disc or drum significantly and obviously worn, 2.7% of tests

From 19,246 DVSA-tracked diesel Audi Tt tests, 2024.

Other Audi Tt fuel types

• Petrol Audi Tt - 79%

All Audi Tt MOT data · Every model