Petrol Mercedes-Benz Cls: MOT pass rate

79.5% of petrol Mercedes-Benz Cls pass the MOT first time, measured across 2,608 DVSA tests on that fuel type alone. Average mileage at test was 85,773.

Petrol against the other Mercedes-Benz Cls versions

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 Cls specifically, petrol is the strongest at 79.5%, and this petrol version sits 2.6 points above the 76.9% model average.

What it means if you are buying one

The petrol Mercedes-Benz Cls 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 Cls had covered 85,773 miles at test, against 93,151 for the diesel. 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 Mercedes-Benz Cls page separate age from fuel if you want to isolate one.

Most common MOT failures on a petrol Mercedes-Benz Cls

1. Any fracture or welding defect on a wheel, 1.4% of tests (23.83x the national rate for this defect)
2. Brake pipe damaged or excessively corroded, 2.9% of tests (2.73x the national rate for this defect)
3. Emissions levels exceed default limits, 0.9% of tests (2.68x the national rate for this defect)
4. Engine MIL illuminated indicating a malfunction, 2.9% of tests (2.25x the national rate for this defect)
5. A tyre cords visible or damaged, 3.4% of tests (2.05x the national rate for this defect)
6. Lambda coefficient outside the default limits or the range specified by the manufacturer, 1% of tests (1.93x the national rate for this defect)
7. A tyre seriously damaged, 4.1% of tests (1.46x the national rate for this defect)
8. A suspension pin, bush or joint excessively worn, 5.9% of tests (1.18x the national rate for this defect)
9. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 2% of tests
10. The aim of a headlamp is not within limits laid down in the requirements, 2% of tests

From 2,639 DVSA-tracked petrol Mercedes-Benz Cls tests, 2024, split out from the Mercedes-Benz Cls's other fuel types. DVSA testers marked 5.62% 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 Cls

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

1. A wheel bearing with excessive play, 4.8% of tests (7.42x the national rate for this defect)
2. A flexible brake hose excessively damaged, deteriorated, chafed, twisted or stretched, 3.9% of tests (6.96x the national rate for this defect)
3. Brake pipe damaged or excessively corroded, 18.6% of tests (3.01x the national rate for this defect), also fails
4. Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow, 2.9% of tests (2.64x the national rate for this defect)
5. A wheel badly distorted or wear between wheel and hub at spigot mounting, 2.7% of tests (2.56x the national rate for this defect)
6. Exhaust system leaking or insecure, 6.1% of tests (2.14x the national rate for this defect)
7. Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, 7% of tests (1.25x the national rate for this defect)
8. Tyre tread depth not in accordance with the requirements, 28.1% of tests
9. A tyre seriously damaged, 11.6% of tests, also fails
10. A suspension pin, bush or joint excessively worn, 11.2% of tests, also fails

From 2,639 DVSA-tracked petrol Mercedes-Benz Cls tests, 2024.

Other Mercedes-Benz Cls fuel types

• Diesel Mercedes-Benz Cls - 76.5%

All Mercedes-Benz Cls MOT data · Every model