Diesel Mercedes-Benz Gla: MOT pass rate

84.2% of diesel Mercedes-Benz Glas pass the MOT first time, measured across 38,987 DVSA tests on that fuel type alone. Average mileage at test was 62,857.

Diesel against the other Mercedes-Benz Gla 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 Gla specifically, petrol is the strongest at 87.7%, and this diesel version sits 1.4 points below the 85.6% model average.

What it means if you are buying one

The diesel Mercedes-Benz Gla 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 Mercedes-Benz Gla had covered 62,857 miles at test, against 41,484 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 Gla page separate age from fuel if you want to isolate one.

Most common MOT failures on a diesel Mercedes-Benz Gla

1. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 3.6% of tests (1.96x the national rate for this defect)
2. Engine MIL illuminated indicating a malfunction, 1.7% of tests (1.36x the national rate for this defect)
3. A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc, 1.9% of tests (1.25x the national rate for this defect)
4. An SRS malfunction indicator lamp (MIL) indicates a system malfunction, 0.5% of tests (1.17x the national rate for this defect)
5. Tyre tread depth not in accordance with the requirements, 2.8% of tests
6. A spring or spring component fractured or seriously weakened, 2.5% of tests
7. A tyre seriously damaged, 2.4% of tests
8. a brake lining or pad worn below 1.5mm, 1.9% of tests
9. Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 1.2% of tests
10. A tyre cords visible or damaged, 1.1% of tests

From 39,134 DVSA-tracked diesel Mercedes-Benz Gla tests, 2024, split out from the Mercedes-Benz Gla's other fuel types. DVSA testers marked 5.99% 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 Gla

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

1. A transmission shaft flexible coupling excessively deteriorated, 0.2% of tests (3.73x the national rate for this defect)
2. Brake disc or drum significantly and obviously worn, 6% of tests (1.88x the national rate for this defect)
3. Lamp emitted colour, position or intensity not in accordance with the requirements, 2% of tests (1.43x the national rate for this defect)
4. a brake lining or pad worn below 1.5mm, 11% of tests (1.17x the national rate for this defect), also fails
5. Tyre tread depth not in accordance with the requirements, 28.9% of tests, also fails
6. A tyre seriously damaged, 15% of tests, also fails
7. Brake disc or drum excessively weakened, insecure or fractured, 11.4% of tests
8. A suspension pin, bush or joint excessively worn, 2.7% of tests
9. Number plate inscription missing or illegible, 1.3% of tests
10. A spring or spring component fractured or seriously weakened, 1.1% of tests, also fails

From 39,134 DVSA-tracked diesel Mercedes-Benz Gla tests, 2024.

Other Mercedes-Benz Gla fuel types

• Petrol Mercedes-Benz Gla - 87.7%

All Mercedes-Benz Gla MOT data · Every model