Diesel Mercedes-Benz Glc: MOT pass rate

87.8% of diesel Mercedes-Benz Glcs pass the MOT first time, measured across 53,068 DVSA tests on that fuel type alone. Average mileage at test was 55,754.

Diesel against the other Mercedes-Benz Glc 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 Mercedes-Benz Glc specifically, petrol is the strongest at 90%, and this diesel version sits 0.4 points below the 88.2% 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 Mercedes-Benz Glc had covered 55,754 miles at test, against 40,637 for the petrol. That is around average, so condition and service history will tell you more than the odometer does.

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 Mercedes-Benz Glc page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Mercedes-Benz Glc

1. Brake lining or pad worn down to wear indicator, 0.6% of tests (2.91x the national rate for this defect)
2. Number plate does not conform to the specified requirements, 0.4% of tests (2.03x the national rate for this defect)
3. A suspension pin, bush or joint excessively worn, 4.1% of tests
4. Tyre tread depth not in accordance with the requirements, 2.8% of tests
5. A tyre seriously damaged, 2.5% of tests
6. A tyre cords visible or damaged, 1.5% of tests
7. Engine MIL illuminated indicating a malfunction, 1.3% of tests
8. a brake lining or pad worn below 1.5mm, 1.1% of tests
9. A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc, 0.8% of tests
10. A spring or spring component fractured or seriously weakened, 0.7% of tests

From 53,231 DVSA-tracked diesel Mercedes-Benz Glc tests, 2024, split out from the Mercedes-Benz Glc's other fuel types. DVSA testers marked 6.35% 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 Mercedes-Benz Glc

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

1. Brake disc or drum significantly and obviously worn, 5.2% of tests (1.62x the national rate for this defect)
2. Number plate missing or so insecure that it is likely to fall off, 0.1% of tests (1.55x the national rate for this defect)
3. a brake lining or pad worn below 1.5mm, 10.8% of tests (1.16x the national rate for this defect), also fails
4. Tyre tread depth not in accordance with the requirements, 29.9% of tests, also fails
5. A tyre seriously damaged, 9.3% of tests, also fails
6. A suspension pin, bush or joint excessively worn, 9% of tests, also fails
7. Brake disc or drum excessively weakened, insecure or fractured, 7.3% of tests
8. Number plate inscription missing or illegible, 1.2% of tests
9. A shock absorber damaged to the extent that it does not function or showing signs of severe leakage, 0.2% of tests
10. A seat belt webbing or flexible stalk significantly stretched or weakened, 0.2% of tests

From 53,231 DVSA-tracked diesel Mercedes-Benz Glc tests, 2024.

Other Mercedes-Benz Glc fuel types

• Petrol Mercedes-Benz Glc - 90%

All Mercedes-Benz Glc MOT data · Every model