Audi S4 - 2021
73.7 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 S4, model year 2021.
Sample size: 180 cars, 445 tests and 328 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: 180 cars
The 2021 Audi S4 has an overall defect rate of 74 defects per 100 vehicles, which is slightly better than the average of 79 defects per 100 vehicles for cars of the same year, representing a 6.2% improvement. Notably, the S4 performs exceptionally well in categories such as Brakes, Steering, and Visibility, showing significantly lower defect rates compared to the average. However, it does face challenges with Wheels, Suspensions & Axles, where its defect rate is higher than average at 107 defects per 100 vehicles. Mileage trends indicate that defect rates increase with higher mileage, consistent with typical patterns observed in vehicles.
Cars by mileage segment
Total: 180 cars
Categories
Brakes
▲ 24.8% better
30.1 faults / 100 tests
Year avg: 40.0 / 100 tests
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Brake disc or drum: significantly and obviously worn
- Excessive fluctuation in brake effort through each wheel revolution
- Brake lining or pad: worn below 1.5mm
- Excessive fluctuation in brake effort through each wheel revolution
Steering
▲ 100.0% better
0.0 faults / 100 tests
Year avg: 0.7 / 100 tests
Visibility
▲ 47.6% better
7.6 faults / 100 tests
Year avg: 14.5 / 100 tests
- Wiper blade: defective
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
- Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
Lights & Electrics
▲ 80.4% better
2.2 faults / 100 tests
Year avg: 11.2 / 100 tests
- The aim of a headlamp is not within limits laid down in the requirements
- The aim of a headlamp is not within limits laid down in the requirements
Wheels & Suspension
▼ 22.6% worse
107.0 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 lump, bulge or tear … or with cords exposed or damaged
- 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
▲ 100.0% better
0.0 faults / 100 tests
Year avg: 2.1 / 100 tests
Equipment
▲ 73.3% better
0.4 faults / 100 tests
Year avg: 1.5 / 100 tests
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction
Other
▲ 100.0% better
0.0 faults / 100 tests
Year avg: 2.7 / 100 tests
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: 114
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 32
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 28
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 26
Brake lining or pad: worn below 1.5mm
ADVISORY
Occurrences: 20
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 18
Brake disc or drum: significantly and obviously worn
ADVISORY
Occurrences: 15
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 14
Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
MINOR
Occurrences: 14
A shock absorber damaged … or showing signs of severe leakage
ADVISORY
Occurrences: 13
Serious faults (Top 10)
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 14
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 13
A spring: or spring component fractured or seriously weakened
FAIL
Occurrences: 2
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 2
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 2
Excessive fluctuation in brake effort through each wheel revolution
FAIL
Occurrences: 1
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 1
Tyre pressure monitoring system malfunctioning or obviously not working
FAIL
Occurrences: 1
An SRS malfunction indicator lamp (MIL) indicates a system malfunction
FAIL
Occurrences: 1
A shock absorber damaged … or showing signs of severe leakage
FAIL
Occurrences: 1