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Bmw Z4 - 2021

47.4 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 Bmw Z4, model year 2021. Sample size: 1,268 cars, 3,545 tests and 1,679 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 1,268 cars

The 2021 BMW Z4 has an overall defect rate of 47 per 100 vehicles, which is significantly lower than the average of 79 per 100 for its year, representing a 40% improvement. Mileage data indicates that the defect rate increases as mileage progresses, particularly noticeable in the 62,000–93,000 miles range, but this model still performs better overall. The Z4 excels notably in categories such as brakes, steering, and body/structure, where it shows virtually no defects compared to higher rates in average vehicles. In contrast, while tyre wear is not specified, the absence of defects in critical areas suggests a strong overall reliability for this model.

Cars by mileage segment

Total: 1,268 cars

More model years for Bmw Z4

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2019 2020 2021 2022

Other models from Bmw

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Categories

Brakes
▲ 98.0% better
0.8 faults / 100 tests
Year avg: 40.0 / 100 tests
  • Brake lining or pad: worn below 1.5mm
  • Excessive fluctuation in brake effort through each wheel revolution
  • Brake lining or pad: worn below 1.5mm
  • Brake disc or drum: insecure, fractured or otherwise likely to fail
  • Flexible brake hose: slightly damaged, chafed or twisted
Steering
▲ 100.0% better
0.0 faults / 100 tests
Year avg: 0.7 / 100 tests
Visibility
▲ 77.2% better
3.3 faults / 100 tests
Year avg: 14.5 / 100 tests
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
  • Wiper blade: missing or obviously not clearing the windscreen
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
  • Wiper blade: defective
  • An obstruction: materially affecting the driver’s view of the road through the swept area of the windscreen or an obligatory external mirror not visible
Lights & Electrics
▲ 74.1% better
2.9 faults / 100 tests
Year avg: 11.2 / 100 tests
  • The aim of a headlamp is not within limits laid down in the requirements
  • A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
  • Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow
  • The aim of a headlamp is not within limits laid down in the requirements
  • Reflector: missing or reflecting white to the rear
Wheels & Suspension
▲ 0.6% better
86.8 faults / 100 tests
Year avg: 87.3 / 100 tests
  • 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
  • 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
Body/Structure
▲ 100.0% better
0.0 faults / 100 tests
Year avg: 2.1 / 100 tests
Equipment
▲ 93.3% better
0.1 faults / 100 tests
Year avg: 1.5 / 100 tests
  • ESC MIL indicates a system malfunction
Other
▲ 63.0% better
1.0 faults / 100 tests
Year avg: 2.7 / 100 tests
  • Lambda coefficient outside the default limits or the range specified by the manufacturer
  • Emissions levels exceed default limits
  • Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
  • Engine MIL inoperative or indicating a malfunction
  • Engine MIL inoperative or indicating a malfunction

Fault rate by mileage segment

Model    Year average
0 275 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: 818
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 311
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 115
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 105
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 68
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 43
A wheel: badly distorted or wear between wheel and hub at spigot mounting
ADVISORY
Occurrences: 31
Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
MINOR
Occurrences: 31
The aim of a headlamp is not within limits laid down in the requirements
PRS
Occurrences: 25
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 14

Serious faults (Top 10)

A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 115
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 68
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 43
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 14
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 8
Any fracture or welding defect on a wheel
FAIL
Occurrences: 7
A suspension joint dust cover: missing or no longer prevents the ingress of dirt etc.
FAIL
Occurrences: 6
A wheel: badly distorted or wear between wheel and hub at spigot mounting
FAIL
Occurrences: 4
Lambda coefficient outside the default limits or the range specified by the manufacturer
FAIL
Occurrences: 3
A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
FAIL
Occurrences: 3