Audi A4 - 2021
77.1 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 Audi A4, model year 2021.
Sample size: 8,055 cars, 18,475 tests and 14,248 recorded faults.
0%
Less faults compared to the average car of same model year
Less faults compared to the average car of same model year
Quick summary
Total: 8,055 cars
The 2021 Audi A4 has an overall defect rate of 77 per 100 vehicles, which is slightly better than the average of 79 per 100. Notably, this model performs exceptionally well in categories such as brakes, steering, and visibility, with significantly lower defect rates compared to the average car. However, it does show a higher incidence of issues related to wheels, suspensions, and axles, standing out with a defect rate of 111 per 100. Mileage trends indicate that defect rates increase with distance, particularly in the higher mileage ranges. Overall, while the Audi A4 excels in several areas, it also has specific concerns that may require attention.
Cars by mileage segment
Total: 8,055 cars
Categories
Brakes
▲ 31.3% better
27.5 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
- Brake lining or pad: worn down to wear indicator
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Brake lining or pad: worn below 1.5mm
Steering
▲ 100.0% better
0.0 faults / 100 tests
Year avg: 0.7 / 100 tests
- A steering ball joint: with excessive wear or free play
Visibility
▲ 37.2% better
9.1 faults / 100 tests
Year avg: 14.5 / 100 tests
- Wiper blade: defective
- 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: missing or obviously not clearing the windscreen
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
Lights & Electrics
▲ 72.3% better
3.1 faults / 100 tests
Year avg: 11.2 / 100 tests
- The aim of a headlamp is not within limits laid down in the requirements
- An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning
- The aim of a headlamp is not within limits laid down in the requirements
- Reflector defective or damaged: by up to 50% of the reflecting surface
- Beam image obviously incorrect
Wheels & Suspension
▼ 27.5% worse
111.3 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 lump, bulge or tear … or with cords exposed or damaged
- Tyre tread depth not in accordance with the requirements
- A spring: or spring component fractured or seriously weakened
- A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
Body/Structure
▲ 81.0% better
0.4 faults / 100 tests
Year avg: 2.1 / 100 tests
- A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
- A passenger seat: with a defective structure or the backrest cannot be retained in the upright position
- A main load-bearing structural member: fractured or deformed such that structural rigidity is significantly reduced
- A transmission shaft constant velocity joint boot: severely deteriorated
- Bumper: insecure or with damage likely to cause injury when grazed or contacted
Equipment
▲ 53.3% better
0.7 faults / 100 tests
Year avg: 1.5 / 100 tests
- Seat belt buckle missing, damaged or not functioning as intended
- Seat belt not functioning as intended or of an incorrect type
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction
- Seat belt buckle missing, damaged or not functioning as intended
- ESC MIL indicates a system malfunction
Other
▲ 22.2% better
2.1 faults / 100 tests
Year avg: 2.7 / 100 tests
- Engine MIL inoperative or indicating a malfunction
- Any part of the noise suppression system: insecure
- Engine MIL inoperative or indicating a malfunction
- Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
- Lambda coefficient outside the default limits or the range specified by the manufacturer
Fault rate by mileage segment
Model
Year average
* Metric: faults per 100 tests.
Most common faults (Top 10)
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 4,906
Brake lining or pad: worn below 1.5mm
ADVISORY
Occurrences: 1,421
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 1,304
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 859
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 735
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 723
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 600
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 461
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 452
Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
MINOR
Occurrences: 417
Serious faults (Top 10)
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 735
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 461
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 452
A shock absorber damaged … or showing signs of severe leakage
FAIL
Occurrences: 102
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 80
Brake lining or pad: worn below 1.5mm
FAIL
Occurrences: 78
Engine MIL inoperative or indicating a malfunction
FAIL
Occurrences: 59
Engine MIL inoperative or indicating a malfunction
FAIL
Occurrences: 55
Brake lining or pad: worn down to wear indicator
FAIL
Occurrences: 44
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 40