Porsche 928 S
From 1,432 MOT tests. Above average for its class.
Common MOT failure categories
Pass rate by registration year
What goes wrong?
The most common MOT failure reasons are 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, the aim of a headlamp is not within limits laid down in the requirements and windscreen washers not working or not providing sufficient fluid to clear the windscreen. The top issue, 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, caused 41 failures in 2024. If you need repairs before retesting, sites like BookMyGarage let you compare local prices.
| 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 | 41 |
| the aim of a headlamp is not within limits laid down in the requirements | 40 |
| windscreen washers not working or not providing sufficient fluid to clear the windscreen | 37 |
| emissions levels exceed default limits | 32 |
| steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc | 24 |
| a lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning | 20 |
| the strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired | 16 |
| a transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc | 14 |
| a brake hose ferrule excessively corroded | 12 |
| brake hose bulging under pressure | 11 |
How serious are these failures?
Not all MOT failures are equal. Only 12.1% of 928 S failures are serious (safety or roadside), below the 44.4% average. When this car fails its MOT, it's more likely to be lights, wipers, or emissions than something dangerous. When it does fail, the average repair bill is around £74.
By registration year
| Year | Pass rate | Top failures |
|---|---|---|
| 1991 | 78% | a rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources, a transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc |
| 1990 | 83.5% | the aim of a headlamp is not within limits laid down in the requirements, windscreen washers not working or not providing sufficient fluid to clear the windscreen |
| 1989 | 83% | the strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, a lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning |
| 1988 | 86.2% | emissions levels exceed default limits, 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 |
3 earlier years
| 1987 | 81.8% | steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, brake hose bulging under pressure |
| 1986 | 82% | the aim of a headlamp is not within limits laid down in the requirements, windscreen washers not working or not providing sufficient fluid to clear the windscreen |
| 1984 | 77.6% | windscreen washers not working or not providing sufficient fluid to clear the windscreen, 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 |
Typical mileage
Half of all 928 Ss tested had between 88,494 and 128,252 miles on the clock. A significant number are high-mileage vehicles.
At 113,760 median miles, the 928 S has 0.016 failures per 10,000 miles driven.
Other Porsche models
| Porsche 911 | 90.7% |
| Porsche Macan | 93.6% |
| Porsche Cayenne | 89.5% |
| Porsche Boxster | 86.8% |
| Porsche Cayman | 92.1% |
Common questions
What is the Porsche 928 S MOT pass rate?
The Porsche 928 S has a 82.3% MOT pass rate based on 1,432 real MOT tests. This is above the national average.
What are common MOT failures on a Porsche 928 S?
The most common MOT failure on the Porsche 928 S is 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, which caused 41 failures. Other common issues include the aim of a headlamp is not within limits laid down in the requirements.
What is the typical mileage of a Porsche 928 S at MOT?
The median mileage at MOT for a Porsche 928 S is 113,760 miles. The middle 50% of vehicles tested have between 88,494 and 128,252 miles.
Buying a used 928 S?
Start with the free tools. Look up the specific vehicle's MOT history on GOV.UK The mileage at each test will show if it's been wound back, and the advisory history tells you what's wearing. Cross-reference that against the typical failures above to see if anything looks unusual for this model.
The free data won't tell you about outstanding finance, theft markers, or write-off history. For that, you need a vehicle history check This is especially important on a private sale where you have fewer legal protections.
With a 82.3% pass rate and an average repair bill of £74 when things go wrong, budget accordingly.
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MOT data from DVSA anonymised test results, 2024 test year. Fleet data from DfT vehicle licensing statistics. Crown copyright, OGL v3.0. MOT pass rates are statistical summaries of test outcomes, not assessments of individual vehicle safety or condition. Always inspect a vehicle and check its full MOT history before purchasing. See terms of use.