Porsche 928 - 1988
146.6 faults per 100 tests
Year average for all cars of 1988 is 253.5 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 928, model year 1988.
Sample size: 106 cars, 193 tests and 283 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: 106 cars
The 1988 Porsche 928 has an overall defect rate of 147 per 100 vehicles, which is significantly lower than the average of 249 per 100, representing a 41% improvement. Notably, the model shows particularly strong performance in several categories, with defects related to brakes, steering, and visibility all being much lower than the yearly average. For instance, only 56% of the 928's vehicles had brake issues compared to a 93% average. Additionally, there is a marked increase in defect rates with mileage; vehicles with over 124,000 miles show a defect rate of 422 per 100, indicating that older models are more prone to faults. Overall, the Porsche 928 stands out positively in multiple categories, confirming its reliability in comparison to other vehicles of the same year.
Cars by mileage segment
Total: 106 cars
More model years for Porsche 928
Other models from Porsche
Categories
Brakes
▲ 41.2% better
56.0 faults / 100 tests
Year avg: 95.2 / 100 tests
- Brake hose ferrules: excessively corroded
- Brake pipe damaged or excessively corroded
- Brake lining or pad: worn below 1.5mm
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Significant brake effort recorded with no brake applied indicating a binding brake
Steering
▲ 33.2% better
18.7 faults / 100 tests
Year avg: 28.0 / 100 tests
- A steering ball joint: with excessive wear or free play
- Excessive radial movement between the top of the steering column and the shaft indicating an excessively worn top bearing
- A steering ball joint: with excessive wear or free play
- Free play in the steering, measured at the rim of the steering wheel is: excessive
- A steering linkage component with: excessive movement between components or likely to become detached
Visibility
▲ 46.7% better
11.4 faults / 100 tests
Year avg: 21.4 / 100 tests
- Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
- Wiper blade: defective
- Wiper blade: missing or obviously not clearing the windscreen
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
- Wiper blade: missing or obviously not clearing the windscreen
Lights & Electrics
▲ 46.8% better
34.2 faults / 100 tests
Year avg: 64.3 / 100 tests
- 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
- Lamp: multiple light source up to a half not functioning
- The aim of a headlamp is not within limits laid down in the requirements
- A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
- Light source and lamp not compatible
Wheels & Suspension
▲ 41.5% better
94.3 faults / 100 tests
Year avg: 161.2 / 100 tests
- A suspension pin, bush, joint or bearing: excessively worn
- A wheel bearing: with excessive play
- The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
- A tyre: with a lump, bulge or tear … or with cords exposed or damaged
- A spring: or spring component fractured or seriously weakened
Body/Structure
▲ 56.3% better
28.0 faults / 100 tests
Year avg: 64.0 / 100 tests
- Exhaust system has a major leak or is insecure
- Fuel system: leaking, or missing or ineffective filler cap
- A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
- Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
- A transmission: joint, belt or chain excessively worn
Equipment
▲ 83.2% better
3.1 faults / 100 tests
Year avg: 18.5 / 100 tests
- Audible warning:
- A seat belt:
Other
▲ 12.2% better
47.7 faults / 100 tests
Year avg: 54.3 / 100 tests
- Emissions levels exceed default limits
- 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)
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 37
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 24
Brake hose ferrules: excessively corroded
ADVISORY
Occurrences: 16
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 14
A wheel bearing: with excessive play
ADVISORY
Occurrences: 13
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 11
Brake pipe damaged or excessively corroded
ADVISORY
Occurrences: 8
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 8
The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
ADVISORY
Occurrences: 8
Emissions levels exceed default limits
FAIL
Occurrences: 7
Serious faults (Top 10)
Emissions levels exceed default limits
FAIL
Occurrences: 7
A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
FAIL
Occurrences: 7
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
FAIL
Occurrences: 6
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 6
The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
FAIL
Occurrences: 5
A steering ball joint: with excessive wear or free play
FAIL
Occurrences: 4
Light source and lamp not compatible
FAIL
Occurrences: 4
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 3
Fuel system: leaking, or missing or ineffective filler cap
FAIL
Occurrences: 2
A door will not open using the relevant control or close properly
FAIL
Occurrences: 2