2018 · 6 years old at test · Diesel mostly

2018 Mercedes-Benz A-Class MOT pass rate and common faults

41,098 MOT tests in 2024. 83.6% passed first time, compared with 82.5% for all cars the same age.

101About average
Passed first time83.6%
Failed or needed repairs16.4%
Typical mileage at test46,000

Most common reasons for failing

Share of all 41,098 tests where this item caused a failure.

  1. Tread depth below requirements of 1.6mm2.6%
    1,734 marked dangerous
  2. Brake pads: less than 1.5 mm thick2.0%
    1,172 marked dangerous
  3. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.7%
  4. Tyres - condition: has ply or cords exposed1.2%
    667 marked dangerous
  5. SRS malfunction indicator lamp: warning lamp indicates a fault1.2%
  6. Malfunction indicator lamp: inoperative or indicates a malfunction1.0%
  7. Tyres - condition: has a bulge, caused by separation or partial failure of its structure0.8%
    433 marked dangerous
  8. Washers: provides insufficient washer liquid0.8%
  9. Wipers: does not clear the windscreen effectively0.7%
  10. Coil spring: fractured or broken0.6%

Problem areas

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

  1. Tyres8.3%
  2. Brakes3.7%
  3. Lights & electrics2.8%
  4. Visibility (wipers, screen, mirrors)2.7%
  5. Seat belts & airbags1.6%
  6. Emissions & leaks1.3%
  7. Suspension1.2%
  8. Wheels0.5%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Tread depth below requirements of 1.6mm17.3%
  2. Brake pads: less than 1.5 mm thick9.9%
  3. Tyres - condition: has a tear, caused by separation or partial failure of its structure9.8%
  4. Brake discs: in such a condition that it is seriously weakened5.6%
  5. Brake discs: significantly and obviously worn4.2%

What this means if you are buying one

This model year is about as good as an average car its age. Before buying, check the area that fails most: tread depth below requirements of 1.6mm. 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 2018 Mercedes-Benz A-Class?

In 2024, 83.6% of 2018 Mercedes-Benz A-Class cars passed their MOT first time, across 41,098 tests. The average for all 6-year-old cars was 82.5%.

What are the most common MOT failures on a 2018 Mercedes-Benz A-Class?

The most common failure reasons were tread depth below requirements of 1.6mm; brake pads: less than 1.5 mm thick; 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 2018 Mercedes-Benz A-Class reliable at MOT time?

Its MOT Rank score is 101, which is about average for a car of its age (100 means exactly average).