Diesel Toyota Yaris: MOT pass rate

70.8% of diesel Toyota Yaris pass the MOT first time, measured across 22,236 DVSA tests on that fuel type alone. Average mileage at test was 112,321.

Diesel against the other Toyota Yaris 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 Toyota Yaris specifically, hybrid is the strongest at 87.7%, and this diesel version sits 8.2 points below the 79% model average.

What it means if you are buying one

The diesel Toyota Yaris 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. 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 Toyota Yaris had covered 112,321 miles at test, against 71,902 for the petrol and 45,303 for the hybrid and 75,141 for the electric. 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 Toyota Yaris page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Toyota Yaris

1. A wheel bearing excessively rough, 1.8% of tests (5.7x the national rate for this defect)
2. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 4% of tests (4.19x the national rate for this defect)
3. Brake pipe damaged or excessively corroded, 3.8% of tests (3.6x the national rate for this defect)
4. A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps, 2.9% of tests (3.27x the national rate for this defect)
5. A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 5.2% of tests (2.34x the national rate for this defect)
6. A spring or spring component fractured or seriously weakened, 4.9% of tests (2.13x the national rate for this defect)
7. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 3.8% of tests (2.08x the national rate for this defect)
8. The aim of a headlamp is not within limits laid down in the requirements, 4.2% of tests (1.77x the national rate for this defect)
9. Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 2.3% of tests (1.68x the national rate for this defect)
10. Wiper blade missing or obviously not clearing the windscreen, 2.9% of tests (1.5x the national rate for this defect)

From 22,346 DVSA-tracked diesel Toyota Yaris tests, 2024, split out from the Toyota Yaris's other fuel types. DVSA testers marked 3.57% 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 Toyota Yaris

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

1. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 9.3% of tests (6.13x the national rate for this defect), also fails
2. Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow, 5.8% of tests (5.24x the national rate for this defect)
3. Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 5.5% of tests (4.38x the national rate for this defect)
4. Brake pipe damaged or excessively corroded, 26.5% of tests (4.27x the national rate for this defect), also fails
5. A spring or spring component fractured or seriously weakened, 15.2% of tests (3.21x the national rate for this defect), also fails
6. A brake hose ferrule excessively corroded, 3.9% of tests (3.03x the national rate for this defect)
7. A suspension component excessively damaged or corroded, 14.4% of tests (2.78x the national rate for this defect)
8. Number plate inscription missing or illegible, 6.6% of tests (2.51x the national rate for this defect)
9. A suspension pin, bush or joint excessively worn, 23.4% of tests (1.75x the national rate for this defect)
10. Tyre tread depth not in accordance with the requirements, 27.1% of tests

From 22,346 DVSA-tracked diesel Toyota Yaris tests, 2024.

Other Toyota Yaris fuel types

• Petrol Toyota Yaris - 77.3%
• Hybrid Toyota Yaris - 87.7%
• Electric Toyota Yaris - 77.1%

All Toyota Yaris MOT data · Every model