2018 Mercedes-Benz B-Class · 13,837 MOT tests
2018 Mercedes-Benz B-Class reliability
2018 Mercedes-Benz B-Classs fail 12.4% of first MOT tests, 9% fewer MOT fails than the average car its age and mileage, ranking 9 of 16 B-Class years (13,837 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Mercedes-Benz B-Classs: 26.5%)
- 12.4%
- first-time fail rate (all Mercedes-Benz B-Classs: 26.5%)
- fails than cars of the same age and mileage
- 9% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 5
- 29,042
- typical miles at its MOT, aged about 5
- MOT tests, 2022 to 2024
- 13,837
- MOT tests, 2022 to 2024
Year on year
2018 against the years either side
- 2017 cars: 10% fewer MOT fails than the average car its age (the 2018 car does worse)
- 2019 cars: 18% fewer MOT fails than the average car its age (the 2018 car does worse)
- Weak spot: tyres, 6% of tests fail here (35% above cars of the same age and mileage).
- Strong point: windscreen, wipers and mirrors, 55% fewer fails than comparable cars.
- Plates: a 2018 car carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
Common problems
What fails on a 2018 Mercedes-Benz B-Class
Fail rate by area
- Tyres6%
- Lights and electrics3.4%
- Windscreen, wipers and mirrors1.4%
- Brakes1.2%
- Suspension0.7%
- Exhaust, emissions and leaks0.5%
- Wheels0.4%
Average for cars of the same age and mileage
Top failures
Tyre cut reaching ply or cords 1.73%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Registration plate lamp not working 1.43%
A dark number plate lamp makes the plate hard to read at night, which is illegal and must be fixed.
Tyre bulge from structural failure 1.21%
A bulge means the tyre's structure has failed and it could burst suddenly, so it must be replaced at once.
Tyre ply or cords exposed 1.07%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Tyre tread below 1.6mm 0.77%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Brake pads worn below 1.5mm 0.75%
Pads worn below 1.5mm lose stopping power and can damage discs, so replacement is needed before the car is driven.
Common advisories
Tyre worn close to legal limit (9.27%) · Tyre slightly damaged or cracking (8.02%) · Brake pads wearing thin (5.88%) · Tyre has a shallow cut (2.41%) · Child seat limits belt inspection (2.27%) · Brake disc pitted or scored (2.2%)
Other years
Every Mercedes-Benz B-Class year
The full picture: Mercedes-Benz B-Class reliability. Before you pay for any Mercedes-Benz B-Class, a Full Check (£9.99) shows finance, stolen and write-off records the MOT can't.
Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 2018 Mercedes-Benz B-Class reliable?
2018 Mercedes-Benz B-Classs fail 12.4% of first MOT tests, 9% fewer MOT fails than the average car its age and mileage, ranking 9 of 16 B-Class years (13,837 DVSA tests, 2022 to 2024).
What fails on a 2018 Mercedes-Benz B-Class MOT?
Most often tyre cut reaching ply or cords (1.73% of tests), registration plate lamp not working (1.43% of tests), tyre bulge from structural failure (1.21% of tests).
How many miles should a 2018 Mercedes-Benz B-Class have done?
At its MOT aged about 5, a typical 2018 Mercedes-Benz B-Class shows 29,042 miles. Much higher or lower is worth asking about.
What plate is a 2018 car?
A car first registered in 2018 carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
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