Porsche
1,547 MOT tests analysed. sits above the UK fleet average — here's where 718 Cayman Gt4s pass, fail, and end up on the retest sheet.
That's 19.8 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
97.3%
Pass-after-fix
0.3%
Fail
1.6%
Avg miles
10,374
Pass + Pass-after-fix + Fail = 100%
Petrol cars first registered from January 2006 meet Euro 4 — compliant in London ULEZ, Birmingham CAZ, Bristol CAZ, and Glasgow LEZ.
Performance by cohort
2 year bands · 1,547 tests
Pass rate drops 1.9 points across the cohorts — recent 718 Cayman Gt4 examples are doing worse than the early cars at the same tested age.
Pass
97.5%
Fail
1.5%
PRS
0.3%
Avg mileage at test
10,486 mi
Pass
95.6%
Fail
2.9%
PRS
0.0%
Avg mileage at test
9,207 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.
The picture
Across 1,547 MOT tests, the 718 Cayman Gt4 returns 97.3% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is lamp emitted colour, position. A tyre with the cords showing and a seriously damaged tyre round out the top three. Average tested mileage sits at 10,374, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
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Lamp emitted colour, position or intensity not in accordance with the requirements
9 occurrences · 0.6% of tests
A tyre cords visible or damaged
6 occurrences · 0.4% of tests
A tyre seriously damaged
6 occurrences · 0.4% of tests
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
4 occurrences · 0.3% of tests
Tyre tread depth not in accordance with the requirements
4 occurrences · 0.3% of tests
Any fracture or welding defect on a wheel
4 occurrences · 0.3% of tests
Brake disc or drum significantly and obviously worn
4 occurrences · 0.3% of tests
Warning device shows system malfunction
3 occurrences · 0.2% of tests
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
2 occurrences · 0.1% of tests
Excessive fluctuation in brake effort through each wheel revolution.
2 occurrences · 0.1% of tests
Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.
Worst-case fix budget · top 2 failures
£120–£190
If every one of this 718 Cayman Gt4's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →
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Build your own retest budget.
Year-band analysis
First-time MOT pass rate split by registration band. A 1.9-point gap between bands is modest — the year you buy Porsche 718 Cayman Gt4 makes a small but real difference to MOT outcomes.
Best band to buy
97.5%
2018–2020 registration
the 2018–2020 band climbs to 97.5% — a 1.9-point improvement. Failures here are mostly wear items: light intensity obviously reduced, has ply or cords exposed — the structural issues that drag down older examples don't appear in the top-10 for this band.
Band to be cautious about
95.6%
2021+ registration
On the 2021-on band, the data shows a 95.6% pass rate against a fleet average of 97.5% on the newer band. The main culprits logged at test: has a cut in excess of the…, excessively fluctuating, and connection leaking on a hydraulic braking system. Average mileage on test for this band is 9,207 miles — high-mileage wear items are a recurring theme.
Best band to buy: 2018-2020 (97.5% first-time pass). Worst band to avoid: 2021+ (95.6% pass). That's a 1.9-point spread across 137 older tests and 1,410 newer ones — year of build makes a material difference on this model.
Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.
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Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.
If you own a 718 Cayman Gt4 and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.
