88.9%
Porsche Cayman pass rate
Used Porsche Cayman buying guide
In 2025, Porsche Cayman cars passed 88.9% of 14,708 initial MOT tests, 16.6 points above the 72.3% UK average. Here is where it fails and what to check before you buy.
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Porsche Cayman MOT record in brief
Initial MOT tests in 2025, retests excluded.
72.3%
UK average, all cars
+16.6
percentage points above average
Ranked on pass rate the Cayman sits 52nd of 575 models in the data. Porsche as a brand averaged 87.6%, so this model runs 1.3 points ahead of its own brand. Porsche Cayman cars aged 3 to 5 years passed 94.9% of MOT tests in 2025; for examples aged 11 years and over that fell to 84.2%.
A pass rate is not a reliability score. The full Porsche Cayman MOT record has the pass rate by age, every common failure and how the Cayman compares with similar cars.
Cayman fuel types
Petrol was the most common fuel among Porsche Cayman cars tested in 2025. None of the tested examples were diesel.
Where the Cayman fails its MOT
Where Porsche Cayman cars that failed their 2025 MOT were marked down, as a share of all recorded failure items.
The specific items testers recorded most often were tread depth below requirements of 1.6mm (8.3%), position lamp not working (7.4%) and rigid brake pipes excessively corroded (5.8%). See every common Cayman MOT failure.
These are DVSA failure records across every Porsche Cayman that failed, not a claim that every Cayman has these problems.
What should you check when buying a used Cayman?
The areas above, most common first, and what an MOT tester looks at in each.
1
Lamps, reflectors and electrical equipment
Walk round with every light on: headlights, brake lights, indicators, fog lights and the number plate lamp. Check no warning lights stay on after starting. 25% of Cayman failure items.
2
Brakes
Make sure the pedal feels firm, the car stops in a straight line, the handbrake holds on a slope and no brake warning light is showing. 18.6% of Cayman failure items.
3
Tyres
Check tread depth across the full width of every tyre (the legal minimum is 1.6mm), and look for cuts, bulges and uneven wear. 17.8% of Cayman failure items.
4
Suspension
Listen for knocks over bumps, check the car sits level, and look for leaking shock absorbers and split rubber gaiters. 11.6% of Cayman failure items.
5
Noise, emissions and leaks
Listen for a blowing exhaust, watch for smoke on start-up and look under the car for oil or fluid leaks. 10% of Cayman failure items.
None of this replaces the car's own record. Run a free MOT history check on the registration to see every test, advisory and recorded mileage for that car.
What the MOT record doesn't tell you
Knowing Porsche Cayman failures cluster around lamps, reflectors and electrical equipment and brakes tells you what to inspect. It tells you nothing about whether the car is safe to buy. An MOT does not show money still owed on the car, a write-off, a theft record or a clocked odometer.
Check the exact Cayman you are looking at. One £15 report, instant results, backed by a £30,000 data guarantee. More on the Porsche history check.
- Outstanding finance
- Write-off records
- Stolen markers
- Mileage history
- Previous keepers
Other used Porsche models
The most-tested Porsche models in 2025, with how their MOT pass rate compares with the Cayman.
Used Porsche Cayman FAQs
Is the Porsche Cayman reliable?
MOT data does not measure reliability. It records whether a car met the roadworthiness standard on the day of its test. What it does show is an 88.9% first-time pass rate for the Porsche Cayman across 14,708 tests in 2025, above the 72.3% average for all cars.
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; for examples aged 11 years and over that fell to 84.2%. On an older example, the car's own MOT history tells you more than the model average.
What should I check before buying a used Porsche Cayman?
On the car itself, start with the areas it most often fails on: lamps, reflectors and electrical equipment, brakes and tyres. Then check the individual car's history: outstanding finance, insurance write-off records, stolen markers, mileage and previous keepers. None of these appear in the MOT record or on the V5C.
How do I check a Porsche Cayman's history?
Enter the registration of the specific car. A Carpeep car history check reports outstanding finance, write-off category, stolen markers, mileage history, previous keepers, MOT and tax status, import and export markers and scrapped status in one £15 report.
MOT figures are aggregated from the DVSA MOT Anonymised data set for 2025 (class 4 initial tests, retests excluded), licensed under the Open Government Licence v3.0. MOT results describe roadworthiness at test, not mechanical reliability.