2020 · 4 years old at test · Diesel mostly

2020 Mercedes-Benz GLB MOT pass rate and common faults

2,539 MOT tests in 2024. 89.0% passed first time, compared with 86.9% for all cars the same age.

102Above average
Passed first time89.0%
Failed or needed repairs11.0%
Typical mileage at test34,000

Most common reasons for failing

Share of all 2,539 tests where this item caused a failure.

  1. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords2.8%
  2. Tyres - condition: has ply or cords exposed1.3%
    50 marked dangerous
  3. Tread depth below requirements of 1.6mm1.1%
    44 marked dangerous
  4. Brake pads: less than 1.5 mm thick1.0%
    41 marked dangerous
  5. Wipers: does not clear the windscreen effectively0.7%
  6. Headlamp aim: too high0.6%
  7. Horn: not working0.4%
  8. Malfunction indicator lamp: inoperative or indicates a malfunction0.4%
  9. SRS malfunction indicator lamp: warning lamp indicates a fault0.3%

Problem areas

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

  1. Tyres6.1%
  2. Lights & electrics1.8%
  3. Brakes1.6%
  4. Visibility (wipers, screen, mirrors)1.5%
  5. Suspension0.7%
  6. Seat belts & airbags0.7%
  7. Emissions & leaks0.4%
  8. Body & chassis0.3%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Tread depth below requirements of 1.6mm12.5%
  2. Brake pads: less than 1.5 mm thick7.8%
  3. Tyres - condition: has a tear, caused by separation or partial failure of its structure6.3%
  4. Non-component advisories: Child Seat fitted not allowing full inspection of adult belt5.1%
  5. Brake discs: significantly and obviously worn3.5%

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: tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords. Then look up the car's own MOT history on GOV.UK with its number plate, and look for repeat advisories.

All GLB years2021 GLB →

Questions

What is the MOT pass rate for a 2020 Mercedes-Benz GLB?

In 2024, 89.0% of 2020 Mercedes-Benz GLB cars passed their MOT first time, across 2,539 tests. The average for all 4-year-old cars was 86.9%.

What are the most common MOT failures on a 2020 Mercedes-Benz GLB?

The most common failure reasons were tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords; tyres - condition: has ply or cords exposed; tread depth below requirements of 1.6mm. The biggest problem area was tyres.

Is the 2020 Mercedes-Benz GLB reliable at MOT time?

Its MOT Rank score is 102, which is above average for a car of its age (100 means exactly average).