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2015 Porsche Cayman: MOT fail rate and common problems

DVSA MOT tests 2022–2025 · 4,432 MOT tests · Updated

6.7% of 2015 Porsche Cayman cars failed their MOT at 10 years; measured against vehicles the same age and test year, about the same as the 2014 and 2016 cars (3,321 MOT tests) [1].

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  • −17.2 to −21.3 points: the gap to all class 4 vehicles the same age and test year, from 7 to 10 years, 4,432 MOT tests
  • 30,000 to 60,000 miles: 8.9% of Porsche Cayman cars first used 2012–2015 failed at 10 years, against 3.5% at under 30,000 miles, 2,950 MOT tests
  • At 10 years (tested 2025): 6.7% failed, against 28.0% for all class 4 vehicles tested at 10 years in 2025, 1,102 MOT tests

Engine, fuel and mileage decide where one vehicle sits within these figures. Check the reg first.

Figures are for 2015 Porsche Cayman cars as a group, not for one car.

Fail rate at 10 years (2025)
6.7%
vs 28.0% for all class 4 vehicles tested at 10 years in 2025
1,102 MOT tests
Gap to all class 4, same age and year
−19.2 pts
over ages 7–10: −21.3 to −17.2 pts
4,432 MOT tests
Against the 2014 and 2016 cars
−0.1 pts
95% range −1.9 to +1.8 pts, same ages, each against its own test year
3,321 MOT tests
MOT tests of 2015 cars
4,432
tested 2022–2025, 4 ages with 1,000+ tests
4,432 MOT tests

About the same as the 2014 and 2016 cars: −0.1 points at the same ages (8–10), each year against all class 4 vehicles the same age tested in its own year; 95% range −1.9 to +1.8, from 3,321 MOT tests of 2015 cars and 5,657 of the 2014 and 2016 cars. Not adjusted for mileage.

Every Porsche Cayman year against all class 4 vehicles the same age

Porsche Cayman first-use years against all class 4 vehicles the same ageEach first-use year of the Porsche Cayman as percentage points above or below all class 4 vehicles the same age, averaged over the ages it was tested at, with 95% intervals. 2015: −19.2 pts. 2006: −21.5 pts (−22.6 to −20.5) against all class 4 vehicles the same age, ages 16–19, 6,046 MOT tests20062007: −22.3 pts (−23.4 to −21.3) against all class 4 vehicles the same age, ages 15–18, 5,742 MOT tests20072013: −23.6 pts (−24.5 to −22.8) against all class 4 vehicles the same age, ages 9–12, 4,208 MOT tests20132014: −21.0 pts (−21.7 to −20.2) against all class 4 vehicles the same age, ages 8–11, 4,838 MOT tests20142015: −19.2 pts (−19.9 to −18.5) against all class 4 vehicles the same age, ages 7–10, 4,432 MOT tests2015−19.22016: −16.6 pts (−17.4 to −15.8) against all class 4 vehicles the same age, ages 6–9, 3,050 MOT tests20162018: −10.4 pts (−11.1 to −9.8) against all class 4 vehicles the same age, ages 4–7, 4,921 MOT tests20182019: −8.8 pts (−9.5 to −8.2) against all class 4 vehicles the same age, ages 3–6, 4,486 MOT tests2019 −24.50+24.5 pts
Percentage points above (right) or below (left) all class 4 vehicles the same age, tested in the same year, 2022 to 2025, each year averaged over the ages it was tested at. Lines show the 95% range.

2015 Porsche Cayman fail rate at each MOT

From 2022 to 2025, as these cars went from 7 to 10 years old, the fail rate went from 4.9% to 6.7%, and the gap to all class 4 vehicles the same age and test year from −17.2 to −21.3 points. The widest gap was at 10 years (−21.3 points, 1,102 MOT tests).

Test yearAgeFail rate95% rangeMOT testsAll class 4, same age and yearGap
20227 years4.9%3.7%–6.3%1,11122.1%−17.2 pts
20238 years5.6%4.4%–7.1%1,13224.4%−18.8 pts
20249 years6.8%5.5%–8.5%1,08726.4%−19.6 pts
202510 years6.7%5.4%–8.3%1,10228.0%−21.3 pts

All class 4: every class 4 vehicle (cars and light vans) tested at that age in the same test year.

2015 against the 2014 and 2016 cars, age by age

Age2015Years either side
8 years5.6% 1,132 MOT tests, tested 20232014: 6.5% (1,232, tested 2022)
2016: 6.9% (1,004, tested 2024)
9 years6.8% 1,087 MOT tests, tested 20242014: 7.8% (1,205, tested 2023)
2016: 6.0% (1,013, tested 2025)
10 years6.7% 1,102 MOT tests, tested 20252014: 8.1% (1,203, tested 2024)

Each year was tested in a different calendar year; the verdict compares each against all class 4 vehicles the same age tested in its own year.

What fails on a Porsche Cayman at 10 years

All Porsche Cayman MOTs at 10 years, cars first used 2012–2015 (3,701 MOT tests; DVSA item counts are not split by first-use year). The most common fail items: tyre tread below 1.6 mm (1.1 per 100 MOT tests, a wear item), wipers not clearing screen (0.8 per 100 MOT tests, a wear item) and tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords (0.6 per 100 MOT tests, a wear item).

No item fails at a clearly different rate from all class 4 vehicles the same age across 3 or more ages.

Mileage and the fail rate at 10 years

Porsche Cayman cars first used 2012–2015 at 30,000 to 60,000 miles failed 8.9% of MOTs at 10 years (1,922 MOT tests), against 3.5% at under 30,000 miles (1,028 MOT tests). All class 4 vehicles: 24.7% and 15.3%.

Road tax for a 2015 Porsche Cayman

The Vehicle Certification Agency lists 15 petrol versions of the Porsche Cayman in its data from August 2013 to August 2015, from 180 to 238 g/km CO2 [3]. A car first registered from 1 March 2001 to 31 March 2017 is taxed by CO2 band, so that is 4 bands from I to L: from £360 to £760 a year at the 2026/27 rates [2].

2015 Porsche Cayman: CO2 bands of the listed versions, 2026/27 rates
Band12 monthsCO2 g/kmVersions listed
I£360180–1833
J£410188–1957
K£445206–2114
L£7602381

Versions listed, not cars sold: this does not say how common each band is. The CO2 figure on the car's V5C log book decides its band. Car tax calculator for a 2015 petrol car

Car tax and ULEZ for a 2015 car

A car first registered in the UK in 2015 was issued a 64 (January–February), 15 (March–August) or 65 (September–December) plate, unless it was registered in Northern Ireland (no age identifier) or has since moved to a private plate. An imported one is plated when first registered here, so its plate can be newer than its first-use year. 15 plates

A 2015 car is taxed by its CO2 emissions band (A to M), shown on the V5C logbook. [2]

For the London ULEZ, a 2015 petrol usually meets Euro 4. The Euro standard of the car decides, not the year alone. [4] ULEZ checker

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Other Porsche Cayman years

  • 2006
  • 2007
  • 2013
  • 2014
  • 2015
  • 2016
  • 2018
  • 2019

Every Porsche Cayman first-use year

Other Porsche models first used in 2015

Questions people ask

What is the MOT fail rate of a 2015 Porsche Cayman?

6.7% at 10 years (tested 2025), from 1,102 MOT tests, against 28.0% for all class 4 vehicles tested at 10 years in 2025.

Does the 2015 Porsche Cayman fail more MOTs than the 2014 and 2016?

0.1 percentage points apart at the same ages (8–10), each against all class 4 vehicles the same age and test year, from 3,321 MOT tests (95% range −1.9 to +1.8), so about the same.

At what ages were 2015 Porsche Cayman cars MOT tested in the data?

4 ages with at least 1,000 MOT tests: 7–10 years, tested 2022–2025, 4,432 MOT tests in all.

What fails most on a Porsche Cayman at 10 years?

1.1 in 100 MOT tests failed on tyre tread below 1.6 mm, the most common fail item (a wear item); the most common non-wear item was rigid brake pipes: excessively corroded (0.6 in 100). From 3,701 MOT tests of Porsche Cayman cars first used 2012–2015, not only 2015.

Sources

  1. Driver and Vehicle Standards Agency, Anonymised MOT tests and results, 2022 to 2025. DVSA MOT data, Open Government Licence v3.0, 4,432 MOT tests. Accessed 7 Oct 2026.
  2. GOV.UK, Vehicle tax rates. Rules, not drawn from the MOT data.
  3. Vehicle Certification Agency, Car fuel and emissions data. VCA data, Open Government Licence v3.0.
  4. Transport for London, Ultra Low Emission Zone. Rules, not drawn from the MOT data.

Cars tested at 10 years are compared with every class 4 vehicle tested at 10 years in the same test year. These rates are not adjusted for mileage. Breakdowns and non-MOT faults are not in this data. How we compare