2009 · 15 years old at test · Petrol mostly

2009 Mercedes-Benz B-Class MOT pass rate and common faults

4,286 MOT tests in 2024. 56.5% passed first time, compared with 58.4% for all cars the same age.

97Below average
Passed first time56.5%
Failed or needed repairs43.5%
Typical mileage at test92,000

Most common reasons for failing

Share of all 4,286 tests where this item caused a failure.

  1. Joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt6.3%
  2. Suspension arms - ball joint: ball joint excessively worn5.5%
  3. Coil spring: fractured or broken5.4%
  4. Rigid brake pipes: excessively corroded4.1%
  5. Linkage ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt3.2%
  6. Rbt (sp): efficiency below requirements3.2%
  7. Side repeaters: not working2.6%
  8. Brake pads: less than 1.5 mm thick2.5%
    132 marked dangerous
  9. Shock absorbers: has a serious fluid leak2.3%
  10. Headlamp: not working on dipped beam2.1%

Problem areas

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

  1. Lights & electrics23.8%
  2. Brakes22.2%
  3. Suspension20.7%
  4. Body & chassis9.9%
  5. Visibility (wipers, screen, mirrors)8.0%
  6. Tyres7.2%
  7. Emissions & leaks5.9%
  8. Seat belts & airbags1.8%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Rigid brake pipes: excessively corroded23.6%
  2. Tread depth below requirements of 1.6mm15.4%
  3. Brake discs: in such a condition that it is seriously weakened13.6%
  4. Tyres - condition: has a tear, caused by separation or partial failure of its structure10.0%
  5. Brake pads: less than 1.5 mm thick8.4%

What this means if you are buying one

This model year fails more often than most cars its age, so budget for repairs and check the history carefully. Before buying, check the area that fails most: joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt. Then look up the car's own MOT history on GOV.UK with its number plate, and look for repeat advisories.

← 2008 B-ClassAll B-Class years2010 B-Class →

Questions

What is the MOT pass rate for a 2009 Mercedes-Benz B-Class?

In 2024, 56.5% of 2009 Mercedes-Benz B-Class cars passed their MOT first time, across 4,286 tests. The average for all 15-year-old cars was 58.4%.

What are the most common MOT failures on a 2009 Mercedes-Benz B-Class?

The most common failure reasons were joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt; suspension arms - ball joint: ball joint excessively worn; coil spring: fractured or broken. The biggest problem area was lights & electrics.

Is the 2009 Mercedes-Benz B-Class reliable at MOT time?

Its MOT Rank score is 97, which is below average for a car of its age (100 means exactly average).