How reliable is the Porsche 911 GT3 compared with other cars?

We do not publish a comparison for the Porsche 911 GT3, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages.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 96.1% across 622 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 911 GT3?

The item recorded most often is "Number plate does not conform to the specified requirements", which appears in 45.5% of failed Porsche 911 GT3 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 911 GT3?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 5.2% of all Porsche 911 GT3 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Porsche 911 GT3 usually have at its MOT?

The average odometer reading recorded at test is 7,821 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 911 GT3 MOT pass rate & common failures

From 622 recorded MOT tests of the Porsche 911 GT3, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 622 MOT tests, 96.1% of Porsche 911 GT3 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Porsche 911 GT3 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 number plate does not conform to the specified requirements, which appears in 45.5% of failed tests. Cars of this model average 7,821 miles on the odometer when tested.

At a glance

Recorded pass rate

96.1%unadjusted, not comparable622 tests

We are not publishing a ranking for the 911 GT3. 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 622 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Porsche 911 GT3 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.Number plate does not conform to the specified requirements45.5%
5 occurrencesRegistration plate missing, insecure or illegible explained
2.Number plate missing or so insecure that it is likely to fall off18.2%
2 occurrencesRegistration plate missing, insecure or illegible explained
3.Windscreen washers not working or not providing sufficient fluid to clear the windscreen18.2%
2 occurrencesWiper or washer not working properly explained
4.A tyre seriously damaged9.1%
1 occurrencesTyre damaged or deteriorated explained
5.A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc9.1%
1 occurrencesDriveshaft CV joint gaiter split or missing explained
6.Engine MIL illuminated indicating a malfunction9.1%
1 occurrencesEngine management light on, or not working explained

Warnings without a failure

Most common advisories

Share of all Porsche 911 GT3 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 requirements5.2%
19 testsTyre worn close to the legal limit explained
2.Nail in tyre2.2%
8 tests
3.A tyre seriously damaged1.1%
4 testsTyre damaged or deteriorated explained
4.A tyre seriously damaged0.5%
2 testsTyre damaged or deteriorated explained
5.A shock absorber damaged to the extent that it does not function or showing signs of severe leakage0.5%
2 testsShock absorber defective explained
6.Brake disc or drum excessively weakened, insecure or fractured0.3%
1 testsBrake disc worn, pitted or scored explained
7.Tyre tread depth not in accordance with the requirements0.3%
1 testsTyre worn close to the legal limit explained

What gets tested

The 911 GT3 fleet

Average mileage recorded at test: 7,821
Fuel mix of tested cars: Petrol100.0%

Trim names grouped into this model (3)

Recorded exactly as DVSA holds them. Trim-level names are rolled up so one model is not split across a dozen thin pages.

911 GT3 S-A
911 GT3 TOURING
911 GT3 TOURING S-A

Check a specific Porsche 911 GT3

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 911 GT3 compared with other cars?: We do not publish a comparison for the Porsche 911 GT3, 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 96.1% across 622 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 911 GT3?: The item recorded most often is "Number plate does not conform to the specified requirements", which appears in 45.5% of failed Porsche 911 GT3 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 911 GT3?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 5.2% of all Porsche 911 GT3 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Porsche 911 GT3 usually have at its MOT?: The average odometer reading recorded at test is 7,821 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.