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Mercedes-benz B - 2021

47.0 faults per 100 tests
Year average for all cars of 2021 is 80.0 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Mercedes-benz B, model year 2021. Sample size: 1,344 cars, 3,239 tests and 1,523 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 1,344 cars

The 2021 Mercedes-Benz B shows a significantly lower overall defect rate compared to the average car of the same year, with 47 defects per 100 vehicles against the average of 79. Notably, this model excels in categories such as brakes, steering, visibility, and lights and electrics, all showing better performance than average. However, it exhibits a higher incidence of equipment-related issues. Mileage trends reveal a consistent pattern, with defect rates increasing as mileage rises, although this model demonstrates lower rates across most mileage segments compared to its peers.

Cars by mileage segment

Total: 1,344 cars

More model years for Mercedes-benz B

2019 2020 2021 2022

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
▲ 63.0% better
14.8 faults / 100 tests
Year avg: 40.0 / 100 tests
  • Brake lining or pad: worn below 1.5mm
  • Brake disc or drum: significantly and obviously worn
Steering
▲ 85.7% better
0.1 faults / 100 tests
Year avg: 0.7 / 100 tests
Visibility
▲ 37.2% better
9.1 faults / 100 tests
Year avg: 14.5 / 100 tests
  • Wiper blade: defective
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
Lights & Electrics
▲ 64.3% better
4.0 faults / 100 tests
Year avg: 11.2 / 100 tests
  • The aim of a headlamp is not within limits laid down in the requirements
Wheels & Suspension
▲ 28.5% better
62.4 faults / 100 tests
Year avg: 87.3 / 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 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
▲ 76.2% better
0.5 faults / 100 tests
Year avg: 2.1 / 100 tests
Equipment
▼ 53.3% worse
2.3 faults / 100 tests
Year avg: 1.5 / 100 tests
Other
▲ 66.7% better
0.9 faults / 100 tests
Year avg: 2.7 / 100 tests

Fault rate by mileage segment

Model    Year average
0 268 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: 414
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 296
Brake lining or pad: worn below 1.5mm
ADVISORY
Occurrences: 96
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 87
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 72
Brake disc or drum: significantly and obviously worn
ADVISORY
Occurrences: 66
Wiper blade: defective
MINOR
Occurrences: 53
Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
MINOR
Occurrences: 40
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 39
The aim of a headlamp is not within limits laid down in the requirements
PRS
Occurrences: 37

Serious faults (Top 10)

A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 87
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 39
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 20
Brake lining or pad: worn below 1.5mm
FAIL
Occurrences: 12
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 9
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 8
An SRS malfunction indicator lamp (MIL) indicates a system malfunction
FAIL
Occurrences: 7
A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
FAIL
Occurrences: 5
Tyre pressure monitoring system malfunctioning or obviously not working
FAIL
Occurrences: 4
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 4