Porsche 911 - 2018
33.4 faults per 100 tests
Year average for all cars of 2018 is 123.2 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 911, model year 2018.
Sample size: 3,195 cars, 8,821 tests and 2,948 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: 3,195 cars
The 2018 Porsche 911 has a significantly lower overall defect rate compared to the average car of the same year, with only 33 defects per 100 vehicles compared to 120. This model stands out positively in several categories, particularly in brakes and steering, where it shows defect rates nearly 90% lower than average. Additionally, it performs well in visibility and lights & electrics, both showing a notable reduction in defects. However, as mileage increases, defect rates for the Porsche rise sharply, especially in the 62,000 to 93,000 miles bracket, indicating potential concerns for older vehicles. Overall, the 911 demonstrates an impressive performance in key areas but may face challenges with age-related wear.
Cars by mileage segment
Total: 3,195 cars
Categories
Brakes
▲ 90.0% better
6.9 faults / 100 tests
Year avg: 68.8 / 100 tests
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Brake lining or pad: worn below 1.5mm
- Excessive fluctuation in brake effort through each wheel revolution
- Brake disc or drum: significantly and obviously worn
- Brake pipe damaged or excessively corroded
Steering
▲ 96.0% better
0.2 faults / 100 tests
Year avg: 5.0 / 100 tests
- A steering ball joint: with excessive wear or free play
Visibility
▲ 71.2% better
4.0 faults / 100 tests
Year avg: 13.9 / 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
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
- Wiper blade: defective
Lights & Electrics
▲ 75.0% better
4.4 faults / 100 tests
Year avg: 17.6 / 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
- Beam image obviously incorrect
- A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
- A lamp: not securely attached
Wheels & Suspension
▲ 60.9% better
49.5 faults / 100 tests
Year avg: 126.7 / 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
▲ 92.2% better
0.4 faults / 100 tests
Year avg: 5.1 / 100 tests
- Exhaust system has a major leak or is insecure
- A transmission shaft constant velocity joint boot: severely deteriorated
- A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
Equipment
▲ 86.4% better
0.3 faults / 100 tests
Year avg: 2.2 / 100 tests
- A seat belt: webbing or flexible stalk significantly stretched or weakened
- A seat belt:
- ESC MIL indicates a system malfunction
- Seat belt retractor not functioning as intended
Other
▲ 84.3% better
1.1 faults / 100 tests
Year avg: 7.0 / 100 tests
- Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
- Exhaust noise levels in excess of those permitted
- Emissions levels exceed default limits
- Lambda coefficient outside the default limits or the range specified by the manufacturer
- Emissions levels exceed the manufacturer’s specified limits
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: 1,170
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 574
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 155
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 127
Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
MINOR
Occurrences: 123
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 93
The aim of a headlamp is not within limits laid down in the requirements
PRS
Occurrences: 77
A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
MINOR
Occurrences: 58
Brake disc or drum: significantly and obviously worn
ADVISORY
Occurrences: 50
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 48
Serious faults (Top 10)
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 127
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 48
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 48
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 23
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 17
Tyre pressure monitoring system malfunctioning or obviously not working
FAIL
Occurrences: 12
Lambda coefficient outside the default limits or the range specified by the manufacturer
FAIL
Occurrences: 11
Headlamp cleaning device: inoperative in the case of LED or gas discharge systems (HID)
FAIL
Occurrences: 7
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 7
Beam image obviously incorrect
FAIL
Occurrences: 7