Petrol Mercedes-Benz B: MOT pass rate
92.6% of petrol Mercedes-Benz Bs pass the MOT first time, measured across 4,792 DVSA tests on that fuel type alone. Average mileage at test was 25,056.
Petrol against the other Mercedes-Benz B versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Petrol | 92.6% | 4,792 |
| Diesel | 91.5% | 3,098 |
| All Mercedes-Benz B | 92.2% | 7,891 |
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 B specifically, petrol is the strongest at 92.6%, and this petrol version sits 0.4 points above the 92.2% 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 petrol Mercedes-Benz B had covered 25,056 miles at test, against 30,697 for the diesel. That is low mileage, which usually means light urban use. Short journeys are harder on batteries, brakes and exhausts than motorway miles, so do not assume low miles means low wear.
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 B page separate age from fuel if you want to isolate one.
Most common MOT failures on a petrol Mercedes-Benz B
- Seat belt buckle missing, damaged or not functioning as intended, 0.3% of tests (2.12x the national rate for this defect)
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction, 0.7% of tests (1.61x the national rate for this defect)
- A tyre seriously damaged, 3.7% of tests (1.34x the national rate for this defect)
- A tyre cords visible or damaged, 1% of tests
- Tyre tread depth not in accordance with the requirements, 0.9% of tests
- a brake lining or pad worn below 1.5mm, 0.6% of tests
- Wiper blade missing or obviously not clearing the windscreen, 0.5% of tests
- The aim of a headlamp is not within limits laid down in the requirements, 0.5% of tests
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 0.2% of tests
- A suspension pin, bush or joint excessively worn, 0.2% of tests
From 4,801 DVSA-tracked petrol Mercedes-Benz B tests, 2024, split out from the Mercedes-Benz B's other fuel types. DVSA testers marked 5.12% 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 B
Flagged but doesn't fail the car, a different list from the failures above.
- A tyre seriously damaged, 19.6% of tests (1.27x the national rate for this defect), also fails
- Tyre tread depth not in accordance with the requirements, 16.6% of tests, also fails
- a brake lining or pad worn below 1.5mm, 6% of tests, also fails
- Brake disc or drum significantly and obviously worn, 2.6% of tests
- Brake disc or drum excessively weakened, insecure or fractured, 2.3% of tests
- A suspension pin, bush or joint excessively worn, 1.1% of tests, also fails
- Number plate inscription missing or illegible, 0.8% of tests
- A wheel bearing with excessive play, 0.3% of tests
- A wheel badly distorted or wear between wheel and hub at spigot mounting, 0.3% of tests
- A seat belt webbing or flexible stalk significantly stretched or weakened, 0.2% of tests
From 4,801 DVSA-tracked petrol Mercedes-Benz B tests, 2024.
Other Mercedes-Benz B fuel types
- Diesel Mercedes-Benz B - 91.5%