Porsche 928
From 460 MOT tests. Above average for its class.
Common MOT failure categories
What goes wrong?
The most common MOT failure reasons are lambda coefficient outside the default limits or the range specified by the manufacturer, the aim of a headlamp is not within limits laid down in the requirements, an obligatory rear fog lamp missing and or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning. The top issue, lambda coefficient outside the default limits or the range specified by the manufacturer, caused 16 failures in 2024. If you need repairs before retesting, sites like BookMyGarage let you compare local prices.
| lambda coefficient outside the default limits or the range specified by the manufacturer | 16 |
| the aim of a headlamp is not within limits laid down in the requirements | 14 |
| 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 | 9 |
| a transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc | 8 |
| power steering fluid leaking or system malfunctioning | 6 |
| the strength or continuity of the load bearing structure within 30cm of any seat belt anchorage (a 'prescribed area') is significantly reduced or inadequately repaired | 6 |
| warning device shows system malfunction | 4 |
| lamp not securely attached | 4 |
| emissions levels exceed default limits | 4 |
| a brake hose ferrule excessively corroded | 4 |
How serious are these failures?
Not all MOT failures are equal. 18.7% of 928 failures could actually strand you: fractured springs, engine faults, exhaust problems. Another 0% are safety issues where the car still drives but shouldn't, such as worn brakes, corroded brake pipes, and steering wear. When it does fail, the average repair bill is around £105.
Porsche 928 on UK roads
The fleet is shrinking: 30 scrapped or exported in the past year with only 9 newly registered, a net loss of 21. Now at 73.7% of its peak (2,808 in 1994 Q4).
Quarterly breakdown
| Quarter | On road | SORN | New | Gone | Net |
|---|---|---|---|---|---|
| 2025 Q3 | 767 | 1,303 | +3 | -0 | +3 |
| 2025 Q2 | 758 | 1,309 | +0 | -0 | +7 |
| 2025 Q1 | 662 | 1,398 | +3 | -8 | -5 |
| 2024 Q4 | 655 | 1,410 | +3 | -22 | -19 |
| 2024 Q3 | 729 | 1,355 | +0 | -6 | -6 |
| 2024 Q2 | 744 | 1,346 | +1 | -0 | +28 |
| 2024 Q1 | 661 | 1,401 | +2 | -37 | -35 |
| 2023 Q4 | 653 | 1,444 | +3 | -4 | -1 |
6 variants on the road
| Variant | Fuel | Licensed | Share |
|---|---|---|---|
| 928 S Series 4 Auto | Petrol | 208 | 30% |
| 928 S Auto | Petrol | 186 | 26% |
| 928 | Petrol | 107 | 15% |
| 928 S | Petrol | 93 | 13% |
| 928 Gt | Petrol | 58 | 8% |
| 928 Gts A | Petrol | 52 | 7% |
Source: DfT vehicle licensing statistics, 2025 Q3. Crown copyright, OGL v3.0.
By registration year
| Year | Pass rate | Top failures |
|---|---|---|
| 1995 | 77.1% | lambda coefficient outside the default limits or the range specified by the manufacturer, a transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc |
Typical mileage
Half of all 928s tested had between 57,828 and 125,366 miles on the clock. A significant number are high-mileage vehicles.
At 93,213 median miles, the 928 has 0.02 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 MOT pass rate?
The Porsche 928 has a 81.1% MOT pass rate based on 460 real MOT tests. This is above the national average.
What are common MOT failures on a Porsche 928?
The most common MOT failure on the Porsche 928 is lambda coefficient outside the default limits or the range specified by the manufacturer, which caused 16 failures. Other common issues include the aim of a headlamp is not within limits laid down in the requirements.
How many Porsche 928s are on UK roads?
There are 767 Porsche 928s currently licensed on UK roads, with 1,303 on SORN.
What is the typical mileage of a Porsche 928 at MOT?
The median mileage at MOT for a Porsche 928 is 93,213 miles. The middle 50% of vehicles tested have between 57,828 and 125,366 miles.
Buying a used 928?
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 81.1% pass rate and an average repair bill of £105 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.