MOT pass rates / Mercedes-Benz
Mercedes-Benz B-class MOT pass rate and common failures
Of 56,323 class-4 normal initial MOT tests in 2024, 70.1% passed without an initial fail or PRS repair — below the 71.2% UK average. Pass rate moves with age: 87.8% of cars aged 3–5 years passed first time, against 55.5% aged 15–30 years.
Checking a Mercedes-Benz B-class?
Model-level statistics cannot reveal the condition or provenance of one car.
Check its registration free for the actual MOT, tax and mileage record. Before buying, the optional £9.99 full history check adds outstanding-finance, stolen and insurance write-off checks.
Pass rate by vehicle age
| Age | Tests | Initial pass rate |
|---|---|---|
| 3–5 years | 443 | 87.8% |
| 6–9 years | 18,908 | 81.5% |
| 10–14 years | 25,269 | 68.1% |
| 15–30 years | 11,703 | 55.5% |
Common initial failure categories
These are the items that most often caused a Mercedes-Benz B-class to fail its first test, with what each one usually means for a buyer.
- Condition — 5.7% of tests. Corrosion, damage or wear on a tested component. Worth seeing in person, as the cost ranges from trivial to structural.
- Anti-roll Bars — 3.9% of tests. Worn anti-roll bar links or bushes. Inexpensive but often recurring.
- Springs — 3.7% of tests. A broken or sagging coil spring. Replaced in pairs, so it is not the cheapest failure.
- Exhaust Emissions — 3.5% of tests. The car exceeded its emissions limits. Can be a sensor or a service, but on a diesel it can also mean an expensive filter or catalyst.
- Headlamp Aim — 3.2% of tests. Headlights pointing too high or low. Cheap to adjust, and common on every make.
- Brake Performance — 3% of tests. The brakes underperformed on the rolling road. Expect brake work rather than an adjustment.
What this does and does not tell you
A pass rate describes how a population of cars behaved on test day. It says nothing about how one car was driven, serviced or repaired, and an MOT does not cover the engine, clutch or gearbox at all.
Use it to know what to look for: if tyres and brakes dominate the list, price those in; if corrosion or suspension appears, get underneath the car. Then check the individual vehicle — its MOT history shows whether these same items have been advised year after year, and its mileage record shows whether the reading is consistent.
How many Mercedes-Benz B-class are left?
At the end of 2026 Q1, DfT recorded 68,153 licensed and 3,261 SORN vehicles in the Mercedes-Benz B-class generic-model group.
Licensed and SORN trend for the Mercedes-Benz B-class
Before you buy
- Condition — 5.7% of tests in 2024. Corrosion, damage or wear on a tested component. Worth seeing in person, as the cost ranges from trivial to structural.
- Anti-roll Bars — 3.9% of tests in 2024. Worn anti-roll bar links or bushes. Inexpensive but often recurring.
- Springs — 3.7% of tests in 2024. A broken or sagging coil spring. Replaced in pairs, so it is not the cheapest failure.
- Exhaust Emissions — 3.5% of tests in 2024. The car exceeded its emissions limits. Can be a sensor or a service, but on a diesel it can also mean an expensive filter or catalyst.
- Check the actual B-class — These figures describe the model group. Enter the registration for that vehicle's free MOT, tax and mileage record before you pay a deposit.
Other Mercedes-Benz models
- Mercedes-Benz C — 74.4% pass
- Mercedes-Benz A-class — 74.6% pass
- Mercedes-Benz E — 76.9% pass
- Mercedes-Benz A — 87.8% pass
- Mercedes-Benz Vito — 66.8% pass
- Mercedes-Benz GLC — 86.5% pass
See every Mercedes-Benz model MOT pass rate
Common questions
What is the Mercedes-Benz B-class MOT pass rate?
70.1% of 56,323 class-4 initial MOT tests on the Mercedes-Benz B-class passed first time in 2024 — below the 71.2% UK average.
Why does the B-class fail its MOT?
The most common initial failure categories are condition (5.7% of tests), anti-roll bars (3.9% of tests), springs (3.7% of tests), exhaust emissions (3.5% of tests).
How many Mercedes-Benz B-class are left in the UK?
68,153 were licensed and 3,261 were SORN at the end of 2026 Q1, according to DfT and DVLA statistics for this generic-model group.
Does this tell me whether one particular B-class is a good buy?
No. These are population statistics. Enter that car's registration for its own MOT, tax and mileage record, then check outstanding finance, write-off and stolen markers before buying.
Methodology and limitations
MOT outcomes describe testable items at the time of inspection. They are not a measure of overall mechanical reliability.
Scope: Class 4 normal initial MOT tests completed in 2024. Models require at least 1,000 qualifying tests. Duplicate source rows are removed using official DVSA test IDs.
Source: Driver and Vehicle Standards Agency anonymised MOT tests and results, 2024, published 2025-05-23 under the Open Government Licence v3.0.
Check the actual car
Enter the registration for that car's own free MOT, tax and mileage record. Before money changes hands, the £9.99 full history check adds outstanding finance, insurance write-off and stolen checks.