How reliable is the Porsche 718 Cayman GT4 compared with other cars?

We do not publish a comparison for the Porsche 718 Cayman GT4, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 95.6% across 955 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.

What is the most common MOT failure on a Porsche 718 Cayman GT4?

The item recorded most often is "A tyre seriously damaged", which appears in 42.4% of failed Porsche 718 Cayman GT4 tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a Porsche 718 Cayman GT4?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 6.2% of all Porsche 718 Cayman GT4 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Porsche 718 Cayman GT4 usually have at its MOT?

The average odometer reading recorded at test is 11,739 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Model reliability file

Porsche 718 Cayman GT4 MOT pass rate & common failures

From 955 recorded MOT tests of the Porsche 718 Cayman GT4, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 955 MOT tests, 95.6% of Porsche 718 Cayman GT4 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Porsche 718 Cayman GT4 fleet does not yet cover a wide enough spread of ages and distances to compare it fairly against other models. Its most commonly recorded failure is tyre seriously damaged, which appears in 42.4% of failed tests. Cars of this model average 11,739 miles on the odometer when tested.

At a glance

Recorded pass rate

95.6%unadjusted, not comparable955 tests

We are not publishing a ranking for the 718 Cayman GT4. The examples tested do not cover a wide enough spread of ages and mileages to compare it fairly, and an unadjusted pass rate mostly sorts models by how recently they were bought rather than how well they were built. The failure and advisory patterns below come from the same 955 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Porsche 718 Cayman GT4 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A tyre seriously damaged42.4%
14 occurrencesTyre damaged or deteriorated explained
2.Tyre tread depth not in accordance with the requirements15.2%
5 occurrencesTyre worn close to the legal limit explained
3.Number plate does not conform to the specified requirements15.2%
5 occurrencesRegistration plate missing, insecure or illegible explained
4.A headlamp cleaning device inoperative in the case of LED or gas discharge systems (HID)9.1%
3 occurrencesHeadlamp not working explained
5.Number plate missing or so insecure that it is likely to fall off6.1%
2 occurrencesRegistration plate missing, insecure or illegible explained
6.A tyre cords visible or damaged6.1%
2 occurrencesTyre ply or cord exposed, or the casing separating explained
7.A tyre seriously damaged3.0%
1 occurrencesTyre damaged or deteriorated explained
8.Windscreen washers not working or not providing sufficient fluid to clear the windscreen3.0%
1 occurrencesWiper or washer not working properly explained
9.Engine MIL illuminated indicating a malfunction3.0%
1 occurrencesEngine management light on, or not working explained
10.Emission control equipment fitted by the manufacturer missing, obviously modified or obviously defective3.0%
1 occurrencesCatalytic converter missing or defective explained

Warnings without a failure

Most common advisories

Share of all Porsche 718 Cayman GT4 tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Tyre tread depth not in accordance with the requirements6.2%
59 testsTyre worn close to the legal limit explained
2.A tyre seriously damaged2.0%
19 testsTyre damaged or deteriorated explained
3.Nail in tyre1.3%
12 tests
4.Tyre tread depth not in accordance with the requirements1.0%
10 testsTyre worn close to the legal limit explained
5.A tyre seriously damaged0.6%
6 testsTyre damaged or deteriorated explained
6.Brake disc or drum significantly and obviously worn0.4%
4 testsBrake disc worn, pitted or scored explained
7.A spring or spring component fractured or seriously weakened0.4%
4 testsRoad spring broken or fractured explained
8.A wheel badly distorted or wear between wheel and hub at spigot mounting0.3%
3 testsRoad wheel damaged, distorted or cracked explained

What gets tested

The 718 Cayman GT4 fleet

Average mileage recorded at test: 11,739
Fuel mix of tested cars: Petrol100.0%

Check a specific Porsche 718 Cayman GT4

A model average tells you the pattern. Its own MOT record tells you the car.

Compare within the range

Other Porsche models

Porsche 911 — 89.5% adjusted
Porsche Macan — 89.5% adjusted
Porsche Boxster — 85.7% adjusted
Porsche Cayenne — 85.3% adjusted
Porsche Cayman — 87.2% adjusted
Porsche Taycan — 91.0% unadjusted
All Porsche models

Common questions

How reliable is the Porsche 718 Cayman GT4 compared with other cars?: We do not publish a comparison for the Porsche 718 Cayman GT4, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 95.6% across 955 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.
What is the most common MOT failure on a Porsche 718 Cayman GT4?: The item recorded most often is "A tyre seriously damaged", which appears in 42.4% of failed Porsche 718 Cayman GT4 tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a Porsche 718 Cayman GT4?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 6.2% of all Porsche 718 Cayman GT4 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Porsche 718 Cayman GT4 usually have at its MOT?: The average odometer reading recorded at test is 11,739 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. No adjusted rate is shown because this model's tested examples do not cover enough of the national age and mileage range for standardisation to mean anything.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.