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Mercedes-benz B-CLASS - 2018

88.6 faults per 100 tests
Year average for all cars of 2018 is 123.2 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 2018. Sample size: 4,078 cars, 8,542 tests and 7,567 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 4,078 cars

The 2018 Mercedes-Benz B-Class has an overall defect rate of 89 per 100 vehicles, which is significantly lower than the average of 120 per 100, representing a 26% improvement. The model excels particularly in braking, steering, and body structure, with defect rates well below the average. Mileage-related trends show that as mileage increases, defect rates for this model also rise, but they remain comparatively lower than those of the average car. There are no notable areas where the B-Class performs worse than average, suggesting a strong reliability profile for this vehicle.

Cars by mileage segment

Total: 4,078 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
▲ 38.4% better
42.4 faults / 100 tests
Year avg: 68.8 / 100 tests
  • Brake lining or pad: worn below 1.5mm
  • Brake disc or drum: insecure, fractured or otherwise likely to fail
  • Brake disc or drum: significantly and obviously worn
Steering
▲ 80.0% better
1.0 faults / 100 tests
Year avg: 5.0 / 100 tests
Visibility
▲ 24.5% better
10.5 faults / 100 tests
Year avg: 13.9 / 100 tests
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
Lights & Electrics
▲ 18.8% better
14.3 faults / 100 tests
Year avg: 17.6 / 100 tests
  • A rear registration plate lamp or light source missing or inoperative: when rear registration plate has only one lamp or all lamps not working
  • A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
Wheels & Suspension
▲ 16.5% better
105.8 faults / 100 tests
Year avg: 126.7 / 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 tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
  • A tyre: with a lump, bulge or tear … or with cords exposed or damaged
Body/Structure
▲ 88.2% better
0.6 faults / 100 tests
Year avg: 5.1 / 100 tests
Equipment
▲ 68.2% better
0.7 faults / 100 tests
Year avg: 2.2 / 100 tests
Other
▲ 72.9% better
1.9 faults / 100 tests
Year avg: 7.0 / 100 tests

Fault rate by mileage segment

Model    Year average
0 307 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)

Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 1,527
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 1,527
Brake lining or pad: worn below 1.5mm
ADVISORY
Occurrences: 737
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 421
Brake disc or drum: significantly and obviously worn
ADVISORY
Occurrences: 380
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 353
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 317
A rear registration plate lamp or light source missing or inoperative: when rear registration plate has only one lamp or all lamps not working
FAIL
Occurrences: 201
A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
MINOR
Occurrences: 201
Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
MINOR
Occurrences: 182

Serious faults (Top 10)

A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 317
A rear registration plate lamp or light source missing or inoperative: when rear registration plate has only one lamp or all lamps not working
FAIL
Occurrences: 201
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 175
A spring: or spring component fractured or seriously weakened
FAIL
Occurrences: 79
Brake lining or pad: worn below 1.5mm
FAIL
Occurrences: 67
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 65
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 56
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 43
A suspension joint dust cover: missing or no longer prevents the ingress of dirt etc.
FAIL
Occurrences: 36
Engine MIL inoperative or indicating a malfunction
FAIL
Occurrences: 23