2015 · 9 years old at test · Diesel mostly

2015 Mercedes-Benz B-Class MOT pass rate and common faults

5,631 MOT tests in 2024. 78.3% passed first time, compared with 73.5% for all cars the same age.

107Above average
Passed first time78.3%
Failed or needed repairs21.7%
Typical mileage at test60,000

Most common reasons for failing

Share of all 5,631 tests where this item caused a failure.

  1. Registration plate lamp(s): inoperative in the case of a single lamp or all lamps3.1%
  2. Coil spring: fractured or broken2.8%
  3. Tyres - condition: has ply or cords exposed1.7%
    126 marked dangerous
  4. Linkage ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt1.7%
  5. Brake pads: less than 1.5 mm thick1.7%
    118 marked dangerous
  6. Malfunction indicator lamp: inoperative or indicates a malfunction1.6%
  7. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.5%
  8. Tread depth below requirements of 1.6mm1.5%
    121 marked dangerous
  9. Tyres - condition: has a bulge, caused by separation or partial failure of its structure1.0%
    63 marked dangerous
  10. Tyre pressure monitoring system: malfunctioning or obviously inoperative0.8%

Problem areas

Failure items found per 100 tests, by part of the car.

  1. Tyres8.2%
  2. Lights & electrics7.8%
  3. Suspension5.7%
  4. Brakes3.7%
  5. Visibility (wipers, screen, mirrors)2.6%
  6. Emissions & leaks2.3%
  7. Seat belts & airbags1.1%
  8. Wheels0.5%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Tread depth below requirements of 1.6mm14.3%
  2. Tyres - condition: has a tear, caused by separation or partial failure of its structure10.0%
  3. Brake pads: less than 1.5 mm thick9.1%
  4. Brake discs: in such a condition that it is seriously weakened6.5%
  5. Brake discs: significantly and obviously worn4.1%

What this means if you are buying one

This model year does better than most cars its age, so it is a reasonable used buy on MOT record alone. Before buying, check the area that fails most: registration plate lamp(s): inoperative in the case of a single lamp or all lamps. Then look up the car's own MOT history on GOV.UK with its number plate, and look for repeat advisories.

← 2014 B-ClassAll B-Class years2016 B-Class →

Questions

What is the MOT pass rate for a 2015 Mercedes-Benz B-Class?

In 2024, 78.3% of 2015 Mercedes-Benz B-Class cars passed their MOT first time, across 5,631 tests. The average for all 9-year-old cars was 73.5%.

What are the most common MOT failures on a 2015 Mercedes-Benz B-Class?

The most common failure reasons were registration plate lamp(s): inoperative in the case of a single lamp or all lamps; coil spring: fractured or broken; tyres - condition: has ply or cords exposed. The biggest problem area was tyres.

Is the 2015 Mercedes-Benz B-Class reliable at MOT time?

Its MOT Rank score is 107, which is above average for a car of its age (100 means exactly average).