88.9%
Porsche Cayman
Porsche Cayman MOT pass rate and common problems
The Porsche Cayman passed 88.9% of its initial MOT tests in 2025, 16.6 percentage points above the 72.3% UK average. The item testers recorded most often was tread depth below requirements of 1.6mm.
Checking a specific car? Its own results, advisories and recorded mileages are in a free MOT history check.
How the Cayman compares
Initial MOT tests in 2025, retests excluded. A car that failed and was repaired at the test station counts as a fail.
87.6%
Porsche average
72.3%
UK average, all cars
The Cayman runs 1.3 points ahead of the Porsche average. It is 4th of the 8 Porsche models in the data. The average Cayman arrived at its test 11.8 years old with 50,794 miles recorded.
A pass rate records whether cars met the roadworthiness standard on test day. It is not a reliability score, and part of any gap reflects how old the tested cars were.
Cayman MOT pass rate by age
The same 2025 tests split by the car's age at test.
Porsche Cayman cars aged 3 to 5 years passed 94.9% of MOT tests. For cars aged 11 years and over that fell to 84.2%, a drop of 10.7 percentage points.
| Age at test | Tests | Pass rate | vs UK average |
|---|---|---|---|
| 3 to 5 years | 1,604 | 94.9% | 22.6 pts above |
| 6 to 10 years | 5,236 | 93.4% | 21.1 pts above |
| 11 years and over | 7,508 | 84.2% | 11.9 pts above |
That is a typical decline as cars age. The UK average of 72.3% covers cars of every age, so compare like with like.
Where Cayman failures cluster
Every failure item recorded on Porsche Cayman cars in 2025, grouped into the DVSA's test areas.
Lamps, reflectors and electrical equipment and brakes together account for 43.6% of recorded failure items. These are recorded failures across the model, not faults every car has.
The 10 most common Cayman MOT failures
Specific items recorded on Porsche Cayman cars that failed their 2025 MOT, as a share of all recorded failure items.
Together these 10 items make up 47.2% of everything testers recorded against failed Porsche Cayman cars. The rest is spread across many smaller items, and one failed test often records several at once.
What to look at on a Cayman
The recorded failures above, grouped by area, biggest first.
1
Lamps, reflectors and electrical equipment
Recorded most often: position lamp not working and headlamp aim too high. 12% of failure items.
2
Tyres
Recorded most often: tread depth below requirements of 1.6mm and condition has a cut in excess of the requirements deep enough to reach the ply or cords. 11.6% of failure items.
3
Suspension
Recorded most often: coil spring fractured or broken and ball joint excessively worn. 7% of failure items.
4
Brakes
Recorded most often: rigid brake pipes excessively corroded. 5.8% of failure items.
The car's own MOT history matters more than any model average. A free MOT history check shows whether a specific Cayman has failed on these items before, or had them noted as advisories. Buying one? See the used Porsche Cayman buying guide.
Already found one?
Check its finance, write-off, theft, mileage and keeper history with a £15 vehicle history report.
Porsche Cayman MOT FAQs
What is the Porsche Cayman MOT pass rate?
88.9% of Porsche Cayman cars passed their initial MOT first time in 2025, from 14,708 tests. That is 16.6 percentage points above the 72.3% average for all cars, and ranks 52nd of 575 models.
What does a Porsche Cayman most commonly fail its MOT on?
The item testers recorded most often on Porsche Cayman cars failing their 2025 MOT was tread depth below requirements of 1.6mm, on 8.3% of failure items. Next were position lamp not working (7.4%) and rigid brake pipes excessively corroded (5.8%).
Which area causes the most Porsche Cayman MOT failures?
Across every recorded failure item, the largest area was lamps, reflectors and electrical equipment at 25%, followed by brakes at 18.6%.
Do older Porsche Cayman cars fail their MOT more often?
Porsche Cayman cars aged 3 to 5 years passed 94.9% of MOT tests in 2025, against 84.2% for cars aged 11 years and over.
Does this mean every Porsche Cayman has these problems?
No. These are the items testers recorded across every Porsche Cayman that failed in 2025. They show where the model most often needs attention, not the condition of any individual car.
How do I see a specific Porsche Cayman's MOT history?
Enter its registration on the free Carpeep MOT history check to see that car's own test results, failures, advisories and recorded mileages.
MOT figures are aggregated from the DVSA MOT Anonymised data set for 2025: class 4 initial tests, retests excluded, with failure items from failed tests (advisories and minor defects excluded), licensed under the Open Government Licence v3.0. MOT results describe roadworthiness at test, not mechanical reliability.