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2018 Porsche Cayman: MOT fail rate and common problems

DVSA MOT tests 2022–2025 · 4,921 MOT tests · Updated

6.2% of 2018 Porsche Cayman cars failed their MOT at 7 years; measured against vehicles the same age and test year, about the same as the 2019 cars (3,722 MOT tests) [1].

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  • −9.1 to −12.8 points: the gap to all class 4 vehicles the same age and test year, from 4 to 7 years, 4,921 MOT tests
  • 30,000 to 60,000 miles: 7.6% of Porsche Cayman cars first used 2015–2018 failed at 7 years, against 4.4% at under 30,000 miles, 3,997 MOT tests
  • At 7 years (tested 2025): 6.2% failed, against 19.0% for all class 4 vehicles tested at 7 years in 2025, 1,199 MOT tests

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

Figures are for 2018 Porsche Cayman cars as a group, not for one car.

Fail rate at 7 years (2025)
6.2%
vs 19.0% for all class 4 vehicles tested at 7 years in 2025
1,199 MOT tests
Gap to all class 4, same age and year
−10.4 pts
over ages 4–7: −12.8 to −9.0 pts
4,921 MOT tests
Against the 2019 cars
−0.1 pts
95% range −1.9 to +1.8 pts, same ages, each against its own test year
3,722 MOT tests
MOT tests of 2018 cars
4,921
tested 2022–2025, 4 ages with 1,000+ tests
4,921 MOT tests

About the same as the 2019 cars: −0.1 points at the same ages (4–6), each year against all class 4 vehicles the same age tested in its own year; 95% range −1.9 to +1.8, from 3,722 MOT tests of 2018 cars and 3,331 of the 2019 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. 2018: −10.4 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 tests20152016: −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 tests2018−10.42019: −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.

2018 Porsche Cayman fail rate at each MOT

From 2022 to 2025, as these cars went from 4 to 7 years old, the fail rate went from 4.6% to 6.2%, and the gap to all class 4 vehicles the same age and test year from −9.1 to −12.8 points. The widest gap was at 7 years (−12.8 points, 1,199 MOT tests).

Test yearAgeFail rate95% rangeMOT testsAll class 4, same age and yearGap
20224 years4.6%3.6%–5.9%1,29613.7%−9.1 pts
20235 years6.0%4.8%–7.5%1,21315.7%−9.7 pts
20246 years7.0%5.7%–8.6%1,21317.4%−10.4 pts
20257 years6.2%4.9%–7.7%1,19919.0%−12.8 pts

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

2018 against the 2019 cars, age by age

Age2018Years either side
4 years4.6% 1,296 MOT tests, tested 20222019: 3.8% (1,145, tested 2023)
5 years6.0% 1,213 MOT tests, tested 20232019: 7.1% (1,093, tested 2024)
6 years7.0% 1,213 MOT tests, tested 20242019: 5.4% (1,093, tested 2025)

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 7 years

All Porsche Cayman MOTs at 7 years, cars first used 2015–2018 (4,211 MOT tests; DVSA item counts are not split by first-use year). The most common fail items: tyre tread below 1.6 mm (1.6 per 100 MOT tests, a wear item), tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords (0.7 per 100 MOT tests, a wear item) and tyre condition: has a bulge, caused by separation or partial failure of its structure (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 7 years

Porsche Cayman cars first used 2015–2018 at 30,000 to 60,000 miles failed 7.6% of MOTs at 7 years (1,752 MOT tests), against 4.4% at under 30,000 miles (2,245 MOT tests). All class 4 vehicles: 19.2% and 12.7%.

Car tax and ULEZ for a 2018 car

A car first registered in the UK in 2018 was issued a 67 (January–February), 18 (March–August) or 68 (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. 18 plates

A 2018 car pays the standard rate after its first year. If its list price was over £40,000 it pays the expensive car supplement in years 2 to 6 (to 2024), which has ended. [2] Car tax calculator for a 2018 petrol car

For the London ULEZ, a 2018 petrol usually meets Euro 4. The Euro standard of the car decides, not the year alone. [3] ULEZ checker

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  • Model risks for this year and fuel
  • What similar cars did at their next MOT
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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 2018

Questions people ask

What is the MOT fail rate of a 2018 Porsche Cayman?

6.2% at 7 years (tested 2025), from 1,199 MOT tests, against 19.0% for all class 4 vehicles tested at 7 years in 2025.

Does the 2018 Porsche Cayman fail more MOTs than the 2019?

0.1 percentage points apart at the same ages (4–6), each against all class 4 vehicles the same age and test year, from 3,722 MOT tests (95% range −1.9 to +1.8), so about the same.

At what ages were 2018 Porsche Cayman cars MOT tested in the data?

4 ages with at least 1,000 MOT tests: 4–7 years, tested 2022–2025, 4,921 MOT tests in all.

What fails most on a Porsche Cayman at 7 years?

1.6 in 100 MOT tests failed on tyre tread below 1.6 mm, the most common fail item (a wear item). From 4,211 MOT tests of Porsche Cayman cars first used 2015–2018, not only 2018.

Sources

  1. Driver and Vehicle Standards Agency, Anonymised MOT tests and results, 2022 to 2025. DVSA MOT data, Open Government Licence v3.0, 4,921 MOT tests. Accessed 7 Oct 2026.
  2. GOV.UK, Vehicle tax rates. Rules, not drawn from the MOT data.
  3. Transport for London, Ultra Low Emission Zone. Rules, not drawn from the MOT data.

Cars tested at 7 years are compared with every class 4 vehicle tested at 7 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