Diesel Dacia Logan: MOT pass rate

75.1% of diesel Dacia Logans pass the MOT first time, measured across 7,660 DVSA tests on that fuel type alone. Average mileage at test was 92,249.

Diesel against the other Dacia Logan 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 Dacia Logan specifically, petrol is the strongest at 80.3%, and this diesel version sits 2.6 points below the 77.7% model average.

What it means if you are buying one

The diesel Dacia Logan 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 Dacia Logan had covered 92,249 miles at test, against 56,505 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 Dacia Logan page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Dacia Logan

1. A suspension component fractured or likely to fail, 2.1% of tests (19.13x the national rate for this defect)
2. Audible warning inoperative, 2.1% of tests (7.39x the national rate for this defect)
3. The aim of a headlamp is not within limits laid down in the requirements, 4.3% of tests (1.83x 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, 1.5% of tests (1.7x the national rate for this defect)
5. Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 2.7% of tests (1.6x the national rate for this defect)
6. A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED, 1.7% of tests (1.38x the national rate for this defect)
7. Significant brake effort recorded with no brake applied indicating a binding brake, 1.4% of tests (1.37x the national rate for this defect)
8. Engine MIL illuminated indicating a malfunction, 1.7% of tests (1.36x the national rate for this defect)
9. Wiper blade missing or obviously not clearing the windscreen, 2.5% of tests (1.29x the national rate for this defect)
10. A steering ball joint with excessive wear or free play, 1.7% of tests (1.27x the national rate for this defect)

From 7,690 DVSA-tracked diesel Dacia Logan tests, 2024, split out from the Dacia Logan's other fuel types. DVSA testers marked 7.33% 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 Dacia Logan

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

1. Brake pedal anti-slip provision missing, loose or worn smooth, 1.1% of tests (5.32x the national rate for this defect)
2. A wheel badly distorted or wear between wheel and hub at spigot mounting, 1.5% of tests (1.38x the national rate for this defect)
3. Tyre tread depth not in accordance with the requirements, 33.3% of tests (1.25x the national rate for this defect)
4. A tyre seriously damaged, 11.8% of tests
5. Brake disc or drum excessively weakened, insecure or fractured, 10.5% of tests
6. A suspension pin, bush or joint excessively worn, 8.5% of tests
7. a brake lining or pad worn below 1.5mm, 5.7% of tests
8. Brake disc or drum significantly and obviously worn, 3.7% of tests
9. Significant brake effort recorded with no brake applied indicating a binding brake, 2% of tests, also fails
10. A suspension component excessively damaged or corroded, 1.9% of tests

From 7,690 DVSA-tracked diesel Dacia Logan tests, 2024.

Other Dacia Logan fuel types

• Petrol Dacia Logan - 80.3%

All Dacia Logan MOT data · Every model