Porsche 928 - 1989
114.6 faults per 100 tests
Year average for all cars of 1989 is 252.8 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 928, model year 1989.
Sample size: 128 cars, 226 tests and 259 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: 128 cars
The 1989 Porsche 928 has an overall defect rate of 115 per 100 vehicles, significantly lower than the average of 249 per 100 for cars of the same year, marking a 54% improvement. This model excels particularly in categories such as brakes and visibility, with defect rates of 34% and 6% respectively, compared to much higher averages. Additionally, while defects increase with mileage, the Porsche shows a relatively steady performance across different mileage segments, particularly maintaining lower defect rates in both high and low mileage ranges. Overall, the Porsche 928 stands out as a notably reliable vehicle from its era.
Cars by mileage segment
Total: 128 cars
More model years for Porsche 928
Other models from Porsche
Categories
Brakes
▲ 65.4% better
33.6 faults / 100 tests
Year avg: 97.1 / 100 tests
- Brake hose ferrules: excessively corroded
- Brake pipe damaged or excessively corroded
- Excessive fluctuation in brake effort through each wheel revolution
- Brake hose bulging under pressure
- Parking brake efficiency: less than 50% of the required value
Steering
▲ 42.5% better
15.0 faults / 100 tests
Year avg: 26.1 / 100 tests
- Steering rack gaiter or ball joint dust cover: damaged or deteriorated
- Power steering fluid leaking or system malfunctioning
- Power steering fluid leaking or system malfunctioning
- Excessive radial movement between the top of the steering column and the shaft indicating an excessively worn top bearing
- Steering rack gaiter or ball joint dust cover: missing or no longer prevents the ingress of dirt etc.
Visibility
▲ 71.8% better
6.2 faults / 100 tests
Year avg: 22.0 / 100 tests
- 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
- Wiper blade: defective
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
- Wiper blade: missing or obviously not clearing the windscreen
Lights & Electrics
▲ 35.2% better
39.8 faults / 100 tests
Year avg: 61.4 / 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
- Lamp emitted colour, position or intensity not in accordance with the requirements
- Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
- Lamp: multiple light source up to a half not functioning
Wheels & Suspension
▲ 56.2% better
72.6 faults / 100 tests
Year avg: 165.6 / 100 tests
- A wheel bearing: with excessive play
- A suspension pin, bush, joint or bearing: excessively worn
- A spring: or spring component fractured or seriously weakened
- Tyre tread depth not in accordance with the requirements
- The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
Body/Structure
▲ 66.9% better
20.4 faults / 100 tests
Year avg: 61.7 / 100 tests
- Fuel pipe or hose: damaged
- A transmission shaft constant velocity joint boot: severely deteriorated
- A transmission shaft: securing bolts loose or missing
- Exhaust system has a major leak or is insecure
- Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
Equipment
▲ 81.1% better
3.5 faults / 100 tests
Year avg: 18.5 / 100 tests
- is significantly reduced or The strength or continuity of the load bearing structure within 30cm of any seat belt anchorage (a ’prescribed area’): inadequately repaired
- Seat belt buckle missing, damaged or not functioning as intended
Other
▲ 28.2% better
38.1 faults / 100 tests
Year avg: 53.1 / 100 tests
- Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
- Engine is idling clearly above its normal idle speed
- 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: 37
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 17
A wheel bearing: with excessive play
ADVISORY
Occurrences: 15
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 14
Brake hose ferrules: excessively corroded
ADVISORY
Occurrences: 13
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 12
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 8
The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
FAIL
Occurrences: 7
Steering rack gaiter or ball joint dust cover: damaged or deteriorated
MINOR
Occurrences: 7
Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
FAIL
Occurrences: 6
Serious faults (Top 10)
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 8
The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
FAIL
Occurrences: 7
Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
FAIL
Occurrences: 6
Emissions levels exceed default limits
FAIL
Occurrences: 5
Brake hose bulging under pressure
FAIL
Occurrences: 4
Headlamp levelling device inoperative
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
Front or rear fog lamp switch:
FAIL
Occurrences: 3
Parking brake efficiency: less than 50% of the required value
FAIL
Occurrences: 3
Power steering fluid leaking or system malfunctioning
FAIL
Occurrences: 2