2017 · 7 years old at test · Diesel mostly

2017 Mercedes-Benz B-Class MOT pass rate and common faults

5,681 MOT tests in 2024. 82.9% passed first time, compared with 79.8% for all cars the same age.

104Above average
Passed first time82.9%
Failed or needed repairs17.1%
Typical mileage at test45,000

Most common reasons for failing

Share of all 5,681 tests where this item caused a failure.

  1. Registration plate lamp(s): inoperative in the case of a single lamp or all lamps2.2%
  2. Coil spring: fractured or broken1.8%
  3. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.8%
  4. Tyres - condition: has ply or cords exposed1.7%
    131 marked dangerous
  5. Malfunction indicator lamp: inoperative or indicates a malfunction1.3%
  6. Tread depth below requirements of 1.6mm1.1%
    83 marked dangerous
  7. Brake pads: less than 1.5 mm thick1.1%
    75 marked dangerous
  8. Tyres - condition: has a bulge, caused by separation or partial failure of its structure1.0%
    66 marked dangerous
  9. Tyres - condition: has a tear, caused by separation or partial failure of its structure0.7%
    53 marked dangerous
  10. Wipers: does not clear the windscreen effectively0.6%

Problem areas

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

  1. Tyres7.7%
  2. Lights & electrics4.9%
  3. Brakes2.7%
  4. Suspension2.6%
  5. Visibility (wipers, screen, mirrors)2.3%
  6. Emissions & leaks1.8%
  7. Wheels0.7%
  8. Seat belts & airbags0.3%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Tread depth below requirements of 1.6mm13.9%
  2. Tyres - condition: has a tear, caused by separation or partial failure of its structure11.4%
  3. Brake pads: less than 1.5 mm thick8.5%
  4. Brake discs: in such a condition that it is seriously weakened5.9%
  5. Brake discs: significantly and obviously worn3.7%

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.

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Questions

What is the MOT pass rate for a 2017 Mercedes-Benz B-Class?

In 2024, 82.9% of 2017 Mercedes-Benz B-Class cars passed their MOT first time, across 5,681 tests. The average for all 7-year-old cars was 79.8%.

What are the most common MOT failures on a 2017 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 a cut in excess of the requirements deep enough to reach the ply or cords. The biggest problem area was tyres.

Is the 2017 Mercedes-Benz B-Class reliable at MOT time?

Its MOT Rank score is 104, which is above average for a car of its age (100 means exactly average).