Porsche common problems and MOT failures
From 429,241 MOT tests in 2024, 7.6% of Porsche vehicles failed. Below are the most common reasons, ranked by how often they occur.
Top Porsche MOT failure reasons
| # | Problem | Occurrences |
|---|---|---|
| 1 | tyre seriously damaged | 4,525 |
| 2 | tyre tread depth outside legal limits | 3,650 |
| 3 | the aim of a headlamp is not within limits the requirements | 3,607 |
| 4 | lambda coefficient outside the default limits or the range specified by the manufacturer | 2,288 |
| 5 | spring or spring component fractured or seriously weakened | 2,275 |
| 6 | tyre cords visible or damaged | 2,260 |
| 7 | brake pipe damaged or excessively corroded | 2,230 |
| 8 | windscreen washers not working or not providing sufficient fluid to clear the windscreen | 1,895 |
| 9 | transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc | 1,765 |
| 10 | lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning | 1,727 |
What this means if you're buying a Porsche
The single most common MOT failure for Porsche is tyre seriously damaged, accounting for 17% of all failure items. A set of new tyres typically costs £200–£500 depending on size.
These figures are from real MOT inspections — they show what testers actually find wrong with Porsche vehicles. If you're viewing a used Porsche, it's worth checking these areas specifically.
Porsche models by MOT pass rate
Lowest pass rates first — these models have the most testable issues.
Buying a specific Porsche? Check the individual vehicle's MOT history for free on GOV.UK to see its actual test results, advisories, and mileage readings.
Check MOT history on GOV.UK