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Mercedes-benz B-CLASS - 2009

292.3 faults per 100 tests
Year average for all cars of 2009 is 311.0 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Mercedes-benz B-CLASS, model year 2009. Sample size: 4,464 cars, 10,256 tests and 29,980 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 4,464 cars

The 2009 Mercedes-Benz B-Class shows an overall defect rate of 292 per 100 cars, which is 6% lower than the average for its year. Notably, the model excels in categories such as steering, lights and electrics, and wheels, with significantly fewer defects compared to the average vehicle. However, it has a higher incidence of brake-related issues, with defects occurring at a rate of 209 per 100 vehicles, well above the average of 121. Additionally, as mileage increases, defect rates for the B-Class also rise, particularly in the higher mileage brackets. Overall, this model demonstrates strengths in several areas but also has a critical flaw with its brakes.

Cars by mileage segment

Total: 4,464 cars

More model years for Mercedes-benz B-CLASS

2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

Other models from Mercedes-benz

Mercedes-benz 190 E Mercedes-benz 300 Mercedes-benz A Mercedes-benz A 180 AMG LINE Mercedes-benz A 180 SPORT Mercedes-benz A 200 Mercedes-benz A 250 AMG LINE Mercedes-benz A-CLASS Mercedes-benz B Mercedes-benz B-CLASS Mercedes-benz C Mercedes-benz CITAN Mercedes-benz CL Mercedes-benz CL 500 Mercedes-benz CLA Mercedes-benz CLC Mercedes-benz CLK Mercedes-benz CLS Mercedes-benz E Mercedes-benz E 220 AMG Mercedes-benz EQA 250 AMG LINE Mercedes-benz EQC 400 AMG LINE Mercedes-benz ESPRINTER Mercedes-benz EVITO Mercedes-benz G Mercedes-benz G-CLASS Mercedes-benz GL Mercedes-benz GLA Mercedes-benz GLA 180 AMG LINE Mercedes-benz GLA 200 AMG LINE Mercedes-benz GLA 250 AMG LINE Mercedes-benz GLA 250 EXCLUSIVE Mercedes-benz GLB 200 AMG LINE Mercedes-benz GLB 220 AMG LINE Mercedes-benz GLC Mercedes-benz GLC 300 AMG Mercedes-benz GLC 300 AMG LINE Mercedes-benz GLE Mercedes-benz GLS Mercedes-benz GT Mercedes-benz ML Mercedes-benz R-Class Mercedes-benz S-Class Mercedes-benz SL Mercedes-benz SLC Mercedes-benz SLK Mercedes-benz SPRINTER Mercedes-benz V Mercedes-benz VIANO Mercedes-benz VITO Mercedes-benz X

Categories

Brakes
▼ 77.4% worse
208.5 faults / 100 tests
Year avg: 117.5 / 100 tests
  • Brake pipe damaged or excessively corroded
  • Brake disc or drum: insecure, fractured or otherwise likely to fail
  • Brake lining or pad: worn below 1.5mm
  • Flexible brake hose: excessively damaged, deteriorated, chafed, twisted or stretched
Steering
▲ 54.0% better
7.5 faults / 100 tests
Year avg: 16.3 / 100 tests
Visibility
▲ 3.8% better
22.5 faults / 100 tests
Year avg: 23.4 / 100 tests
Lights & Electrics
▲ 30.5% better
56.2 faults / 100 tests
Year avg: 80.9 / 100 tests
Wheels & Suspension
▲ 26.9% better
219.2 faults / 100 tests
Year avg: 299.8 / 100 tests
  • Tyre tread depth not in accordance with the requirements
  • A tyre: with a lump, bulge or tear … or with cords exposed or damaged
  • A suspension pin, bush, joint or bearing: excessively worn
  • A shock absorber damaged … or showing signs of severe leakage
  • A spring: or spring component fractured or seriously weakened
Body/Structure
▼ 13.3% worse
47.0 faults / 100 tests
Year avg: 41.5 / 100 tests
  • A transmission shaft constant velocity joint boot: severely deteriorated
Equipment
▲ 10.8% better
7.4 faults / 100 tests
Year avg: 8.3 / 100 tests
Other
▲ 52.9% better
16.2 faults / 100 tests
Year avg: 34.4 / 100 tests

Fault rate by mileage segment

Model    Year average
0 454 0–31,000 mi 31,000–62,000 62,000–93,000 93,000–124,000 124,000+
* Metric: faults per 100 tests.

Most common faults (Top 10)

Brake pipe damaged or excessively corroded
ADVISORY
Occurrences: 3,600
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 2,529
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 1,966
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 1,635
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 1,035
A transmission shaft constant velocity joint boot: severely deteriorated
MINOR
Occurrences: 1,009
Brake lining or pad: worn below 1.5mm
ADVISORY
Occurrences: 947
Flexible brake hose: excessively damaged, deteriorated, chafed, twisted or stretched
ADVISORY
Occurrences: 925
A shock absorber damaged … or showing signs of severe leakage
ADVISORY
Occurrences: 882
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 740

Serious faults (Top 10)

A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
FAIL
Occurrences: 576
A suspension pin, bush, joint or bearing: excessively worn
FAIL
Occurrences: 557
A spring: or spring component fractured or seriously weakened
FAIL
Occurrences: 485
A suspension joint dust cover: missing or no longer prevents the ingress of dirt etc.
FAIL
Occurrences: 456
Brake pipe damaged or excessively corroded
FAIL
Occurrences: 455
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 259
A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
FAIL
Occurrences: 254
Parking brake efficiency: below minimum requirement
FAIL
Occurrences: 253
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 253
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 196