Porsche Cayman reliability, MPG and running costs
Figures updated
The Porsche Cayman is a car. In 2024 MOT tests it scored 224 for reliability (100 is average), ranking 18 of 442, and 11.5% failed first time against a UK average of 28.5%. Its most common MOT failure is position lamp (1.4% of tests).
Ranked 18 of 442 cars in the 2024 MOT Reliability League
In 2024, 14,248 Porsche Caymans aged 3 to 20 had an MOT and 11.5% failed first time (UK average 28.5%). Taking age and mileage into account, the Porsche Cayman is 55% less likely to fail than the average car of the same age and mileage. At the first MOT, at three years old, 4.6% failed (UK 12.7%).
First-time fail rate
11.5%
UK 28.5%
Fail rate at 3 years
4.6%
UK 12.7%
Average miles a year
4,700
Typical age at test: 10 years
Porsche Cayman MOT failure rate by age
Most common Porsche Cayman MOT faults
- Position lamp: not working1.4% of tests
- Tread depth: tread depth below requirements of 1.6mm1.1% of tests
- Catalyst emissions: Lambda reading after 2nd fast idle outside specified limits0.9% of tests
- Headlamp aim: too high0.8% of tests
- Coil spring: fractured or broken0.8% of tests
- Wipers: does not clear the windscreen effectively0.8% of tests
What the Porsche Cayman fails on
| Area | Tests failing | vs similar cars |
|---|---|---|
| Lights and electrics | 3.7% | ▼ 62% less often |
| Tyres | 2.9% | ▼ 44% less often |
| Suspension | 2.1% | ▼ 73% less often |
| Brakes | 2.1% | ▼ 64% less often |
| Exhaust and emissions | 1.7% | ▼ 36% less often |
| Visibility | 1.4% | ▼ 69% less often |
| Body and structure | 0.6% | ▼ 82% less often |
| Steering | 0.4% | ▼ 73% less often |
| Seat belts and airbags | 0.2% | ▼ 77% less often |
| Wheels | 0.1% | ▼ 62% less often |
What MPG does the Porsche Cayman do?
Official economy for the Porsche Cayman ranges from 25.7 to 36.7mpg across the 39 versions listed by the Vehicle Certification Agency (2008–2016). A typical petrol version manages 30.4mpg. Expect 10–15% less in real-world driving.
Work out a journey's fuel costHow much is road tax on a Porsche Cayman?
Any Porsche Cayman first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). A Porsche Cayman registered between March 2001 and March 2017 is taxed on its CO2: £360 to £790 a year.
Work out tax for a specific carPorsche Cayman specs and running costs
Official figures for 39 versions sold in the UK between 2008 and 2016.
Fuel types
Petrol
Official economy
25.7–36.7 mpg
CO2
180–262 g/km
| Version | Fuel | Economy | CO2 | Car tax |
|---|---|---|---|---|
| Cayman 2.7 Euro 6M6 · listed 2016 | Petrol | 33.6 mpg | 195g | £410 |
| Cayman 2.7 PDK Euro 6A7 · listed 2016 | Petrol | 35.8 mpg | 183g | £360 |
| Cayman Black EditionM6 · listed 2016 | Petrol | 33.6 mpg | 195g | £410 |
| Cayman Black Edition PDKA7 · listed 2016 | Petrol | 35.8 mpg | 183g | £360 |
| Cayman GT4M6 · listed 2016 | Petrol | 27.4 mpg | 238g | £760 |
| Cayman GTS PDKA7 · listed 2016 | Petrol | 34.4 mpg | 190g | £410 |
| Cayman S Euro 6M6 · listed 2016 | Petrol | 31.4 mpg | 211g | £445 |
| Cayman S PDK Euro 6A7 · listed 2016 | Petrol | 34.4 mpg | 190g | £410 |
| Cayman GTSM6 · listed 2015 | Petrol | 31.4 mpg | 211g | £445 |
| Cayman 2.7 PDKAutomatic · listed 2014 | Petrol | 36.7 mpg | 180g | £360 |
| Cayman S PDKAutomatic · listed 2014 | Petrol | 35.3 mpg | 188g | £410 |
| Cayman 2.7Manual · listed 2014 | Petrol | 34.4 mpg | 192g | £410 |
| Cayman SManual · listed 2014 | Petrol | 32.1 mpg | 206g | £445 |
| Cayman GTSManual · listed 2014 | Petrol | 31.4 mpg | 211g | £445 |
| Cayman 2.9Manual · listed 2013 | Petrol | 30.1 mpg | 221g | £445 |
Economy and CO2 are official NEDC (before 2018) or WLTP figures. Car tax is the yearly rate at current rates for a car first registered in the year listed, before any expensive car supplement. Showing the 15 most recent of 39 versions.
What a Porsche Cayman costs to fuel
- petrol, typical official 30.4mpg…
Official figures are usually 10–15% better than real-world driving.
Work out a journey in a Porsche CaymanBuying a used Porsche Cayman?
Check the MOT history of the exact car: every result, advisory and mileage reading, free.
Other Porsche models
Frequently asked questions
›Is the Porsche Cayman reliable?
Its MOT record is better than average: the Porsche Cayman is 55% less likely to fail than the average car of the same age and mileage, with a reliability score of 224 in our 2024 league (100 is average).
›What are common problems with the Porsche Cayman?
The most common MOT fault is “Position lamp: not working”, found in 1.4% of tests.
›What MPG does the Porsche Cayman do?
Official economy for the Porsche Cayman ranges from 25.7 to 36.7mpg across the 39 versions listed by the Vehicle Certification Agency (2008–2016). A typical petrol version manages 30.4mpg. Expect 10–15% less in real-world driving.
›How much is road tax on a Porsche Cayman?
Any Porsche Cayman first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). A Porsche Cayman registered between March 2001 and March 2017 is taxed on its CO2: £360 to £790 a year.
›How many Porsche Caymans fail their MOT?
11.5% of Porsche Caymans aged 3 to 20 failed their MOT first time in 2024, and 4.6% failed at their first MOT.
Sources: DVSA anonymised MOT tests 2024, all versions of the Porsche Cayman combined (Open Government Licence v3.0); official economy and CO2 from Vehicle Certification Agency data, © Crown copyright. VCA cannot accept liability for its accuracy. How we calculate the league.