Petrol Mercedes-Benz Cla: MOT pass rate
85.2% of petrol Mercedes-Benz Clas pass the MOT first time, measured across 34,177 DVSA tests on that fuel type alone. Average mileage at test was 47,475.
Petrol against the other Mercedes-Benz Cla versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Petrol | 85.2% | 34,177 |
| Diesel | 80.4% | 23,165 |
| All Mercedes-Benz Cla | 83.3% | 57,347 |
Why the fuel type changes the number
Petrol cars avoid the DPF and emissions failures that catch diesels, and usually fail on the same consumables as any other car.
On the Mercedes-Benz Cla specifically, petrol is the strongest at 85.2%, and this petrol version sits 1.9 points above the 83.3% model average.
What it means if you are buying one
The petrol Mercedes-Benz Cla 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 petrol Mercedes-Benz Cla had covered 47,475 miles at test, against 77,920 for the diesel. That is below average for a car this age, worth a mileage-consistency check since an unusually low reading is sometimes clocking rather than luck.
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 Cla page separate age from fuel if you want to isolate one.
Most common MOT failures on a petrol Mercedes-Benz Cla
- Brake lining or pad worn down to wear indicator, 0.6% of tests (3x the national rate for this defect)
- Number plate does not conform to the specified requirements, 0.5% of tests (2.6x the national rate for this defect)
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction, 0.7% of tests (1.76x the national rate for this defect)
- A tyre cords visible or damaged, 2.8% of tests (1.65x the national rate for this defect)
- A tyre seriously damaged, 4.4% of tests (1.57x the national rate for this defect)
- Tyre tread depth not in accordance with the requirements, 3.2% of tests
- a brake lining or pad worn below 1.5mm, 2.1% of tests
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 1.3% of tests
- Wiper blade missing or obviously not clearing the windscreen, 1% of tests
- Engine MIL illuminated indicating a malfunction, 0.9% of tests
From 34,328 DVSA-tracked petrol Mercedes-Benz Cla tests, 2024, split out from the Mercedes-Benz Cla's other fuel types. DVSA testers marked 9.45% 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 petrol Mercedes-Benz Cla
Flagged but doesn't fail the car, a different list from the failures above.
- Brake disc or drum significantly and obviously worn, 4.8% of tests (1.52x the national rate for this defect)
- a brake lining or pad worn below 1.5mm, 11.1% of tests (1.19x the national rate for this defect), also fails
- Tyre tread depth not in accordance with the requirements, 26.9% of tests, also fails
- A tyre seriously damaged, 17.8% of tests, also fails
- Brake disc or drum excessively weakened, insecure or fractured, 8% of tests
- A suspension pin, bush or joint excessively worn, 1.3% of tests
- A wheel badly distorted or wear between wheel and hub at spigot mounting, 1.2% of tests
- Lamp emitted colour, position or intensity not in accordance with the requirements, 0.8% of tests
- Number plate inscription missing or illegible, 0.7% of tests
- Brake pipe damaged or excessively corroded, 0.6% of tests
From 34,328 DVSA-tracked petrol Mercedes-Benz Cla tests, 2024.
Other Mercedes-Benz Cla fuel types
- Diesel Mercedes-Benz Cla - 80.4%