Audi S4 - 2005
252.6 faults per 100 tests
Year average for all cars of 2005 is 377.4 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Audi S4, model year 2005.
Sample size: 137 cars, 266 tests and 672 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: 137 cars
The 2005 Audi S4 has an overall defect rate of 253 per 100 vehicles, significantly lower than the yearly average of 376 per 100, making it 32.7% better than its peers. Notably, it performs exceptionally well in categories such as brakes, steering, visibility, and lights and electrics, with defect rates much lower than the average. However, the model does show a higher occurrence of defects in the "Other" category, suggesting some specific issues that are less common in average vehicles. Mileage trends indicate that as the vehicle ages, defect rates increase, particularly in the 31,000 to 62,000-mile range. Overall, the Audi S4 demonstrates solid reliability compared to other cars of the same year.
Cars by mileage segment
Total: 137 cars
Categories
Brakes
▲ 36.4% better
100.8 faults / 100 tests
Year avg: 158.5 / 100 tests
- Flexible brake hose: excessively damaged, deteriorated, chafed, twisted or stretched
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Brake disc or drum: significantly and obviously worn
- Brake hose ferrules: excessively corroded
- Brake lining or pad: worn below 1.5mm
Steering
▲ 73.2% better
6.0 faults / 100 tests
Year avg: 22.4 / 100 tests
- A steering ball joint: with excessive wear or free play
- A steering ball joint: with excessive wear or free play
- Steering rack gaiter or ball joint dust cover: missing or no longer prevents the ingress of dirt etc.
- Steering rack gaiter or ball joint dust cover: damaged or deteriorated
Visibility
▲ 63.0% better
10.5 faults / 100 tests
Year avg: 28.4 / 100 tests
- Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
- Obligatory mirror or device: slightly damaged or loose
- Wiper blade: missing or obviously not clearing the windscreen
- A bonnet: which cannot be safely secured in the closed position
- Wiper blade: missing or obviously not clearing the windscreen
Lights & Electrics
▲ 52.9% better
51.9 faults / 100 tests
Year avg: 110.1 / 100 tests
- A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
- A rear registration plate lamp or light source missing or inoperative: when rear registration plate has only one lamp or all lamps not working
- The aim of a headlamp is not within limits laid down in the requirements
- Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow
- Headlamp reflector or lens: slightly defective
Wheels & Suspension
▲ 26.0% better
232.3 faults / 100 tests
Year avg: 314.1 / 100 tests
- A suspension pin, bush, joint or bearing: excessively worn
- A tyre: with a lump, bulge or tear … or with cords exposed or damaged
- A suspension component: excessively damaged or corroded
- Tyre tread depth not in accordance with the requirements
- A suspension pin, bush, joint or bearing: excessively worn
Body/Structure
▲ 55.9% better
27.1 faults / 100 tests
Year avg: 61.5 / 100 tests
- Exhaust system has a major leak or is insecure
- Exhaust system has a major leak or is insecure
- A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
- A transmission shaft constant velocity joint boot: severely deteriorated
- Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
Equipment
▲ 41.9% better
7.5 faults / 100 tests
Year avg: 12.9 / 100 tests
- Seat belt buckle missing, damaged or not functioning as intended
- ESC MIL indicates a system malfunction
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction
- Audible warning:
Other
▼ 48.2% worse
69.2 faults / 100 tests
Year avg: 46.7 / 100 tests
- 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
- Any part of the noise suppression system: insecure
- Emissions levels exceed the manufacturer’s specified limits
- Emissions levels exceed default limits
Fault rate by mileage segment
Model
Year average
* Metric: faults per 100 tests.
Most common faults (Top 10)
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 68
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 65
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 47
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 43
A suspension pin, bush, joint or bearing: excessively worn
FAIL
Occurrences: 38
Flexible brake hose: excessively damaged, deteriorated, chafed, twisted or stretched
ADVISORY
Occurrences: 37
Brake hose ferrules: excessively corroded
ADVISORY
Occurrences: 30
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 29
A suspension component: excessively damaged or corroded
ADVISORY
Occurrences: 24
A suspension joint dust cover: severely deteriorated
MINOR
Occurrences: 23
Serious faults (Top 10)
A suspension pin, bush, joint or bearing: excessively worn
FAIL
Occurrences: 38
Emissions levels exceed the manufacturer’s specified limits
FAIL
Occurrences: 8
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: 7
Lambda coefficient outside the default limits or the range specified by the manufacturer
FAIL
Occurrences: 6
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 6
A suspension joint dust cover: missing or no longer prevents the ingress of dirt etc.
FAIL
Occurrences: 6
Exhaust system has a major leak or is insecure
FAIL
Occurrences: 5
Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
FAIL
Occurrences: 5
A spring: or spring component fractured or seriously weakened
FAIL
Occurrences: 4
A steering ball joint: with excessive wear or free play
FAIL
Occurrences: 4