Is the Porsche Boxster reliable?

On MOT evidence the Porsche Boxster is well above average. It passes 85.7% of tests once age and mileage are accounted for, against a national average of 72.3%. That figure covers 84% of the national age and mileage range, which is enough to quote but not to rank. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.

What do testers most often warn about on a Porsche Boxster?

The most common advisory is "Brake pipe damaged or excessively corroded", noted on 21.2% of all Porsche Boxster tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Porsche Boxster usually have at its MOT?

The average odometer reading recorded at test is 65,952 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.

Does a Porsche Boxster get harder to pass as it ages?

Yes. At 3 to 5 years old, 94.4% of Porsche Boxster tests pass. By fifteen years or more, that falls to 77.9%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

Model reliability file

Porsche Boxster MOT pass rate & common failures

From 32,281 recorded MOT tests of the Porsche Boxster, published by DVSA.

Data updated 29 July 2026

Quick answer

The Porsche Boxster passes 85.7% of MOT tests once results are adjusted for the age and mileage of the cars tested, against a national average of 72.3%. That is well above average. Based on 32,281 tests. Its most commonly recorded failure is lambda coefficient outside the default limits or the range specified by the manufacturer, which appears in 20.3% of failed tests. Cars of this model average 65,952 miles on the odometer when tested.

At a glance

Pass rate, adjusted for age and mileage

85.7%national average72.3%unadjusted82.6%range covered84%

The Boxster is 13.4 percentage points above the national pass rate once age and mileage are accounted for, which is well above average. The unadjusted figure is 82.6%; the difference is what the age and mileage of this model’s fleet was hiding.

DVSA recorded wording

Most common failure items

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

1.Lambda coefficient outside the default limits or the range specified by the manufacturer20.3%
969 occurrencesEmissions above the permitted limit explained
2.Brake pipe damaged or excessively corroded15.5%
741 occurrencesBrake pipe corroded explained
3.A spring or spring component fractured or seriously weakened11.5%
550 occurrencesRoad spring broken or fractured explained
4.Tyre tread depth not in accordance with the requirements8.8%
421 occurrencesTyre worn close to the legal limit explained
5.The aim of a headlamp is not within limits laid down in the requirements7.8%
371 occurrencesHeadlamp aim incorrect explained
6.Wiper blade missing or obviously not clearing the windscreen6.7%
322 occurrencesWiper or washer not working properly explained
7.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning6.4%
304 occurrencesLamp not working explained
8.A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc6.0%
285 occurrencesDriveshaft CV joint gaiter split or missing explained
9.A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED5.6%
270 occurrencesHeadlamp not working explained
10.A tyre seriously damaged5.4%
260 occurrencesTyre damaged or deteriorated explained

Warnings without a failure

Most common advisories

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

1.Brake pipe damaged or excessively corroded21.2%
6,853 testsBrake pipe corroded explained
2.Brake disc or drum excessively weakened, insecure or fractured15.5%
4,997 testsBrake disc worn, pitted or scored explained
3.Tyre tread depth not in accordance with the requirements14.4%
4,633 testsTyre worn close to the legal limit explained
4.A tyre seriously damaged12.7%
4,095 testsTyre damaged or deteriorated explained
5.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users5.2%
1,693 tests
6.A suspension pin, bush or joint excessively worn2.9%
937 testsSuspension arm bush worn explained
7.A suspension pin, bush or joint excessively worn2.4%
785 testsSuspension arm bush worn explained
8.Play in steering rack inner joint(s)2.4%
769 tests

How wear changes the picture

Pass rate by vehicle age

3–5 yrs94%

6–8 yrs94%

9–11 yrs92%

12–14 yrs90%

15+ yrs78%

Bands holding too few tests to be meaningful are omitted rather than shown as a rate.

What gets tested

The Boxster fleet

Average mileage recorded at test: 65,952
Fuel mix of tested cars: Petrol99.9%

Trim names grouped into this model (12)

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

BOXSTER AUTO
BOXSTER RS60
BOXSTER RS60 TIPTRON S A
BOXSTER S
BOXSTER S BLACK EDITION
BOXSTER S BLACK EDITION AUTO
BOXSTER S S-A
BOXSTER S TIPTRONIC
BOXSTER S TIPTRONIC S
BOXSTER S-A
BOXSTER SPORT EDITION 6SP
BOXSTER TIPTRONIC S

Check a specific Porsche Boxster

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 Cayenne — 85.3% adjusted
Porsche Cayman — 87.2% adjusted
Porsche Taycan — 91.0% unadjusted
Porsche Panamera — 87.8% adjusted
All Porsche models

Similar test volumes

Compare against other makes

Lexus NX — 89.3% adjusted, ranked 5
Suzuki Ignis — 73.5% adjusted, ranked 127
DS DS3 — 68.0% adjusted, ranked 197
Hyundai Santa FE — 72.2% adjusted, ranked 145

Common questions

Is the Porsche Boxster reliable?: On MOT evidence the Porsche Boxster is well above average. It passes 85.7% of tests once age and mileage are accounted for, against a national average of 72.3%. That figure covers 84% of the national age and mileage range, which is enough to quote but not to rank. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.
What is the most common MOT failure on a Porsche Boxster?: The item recorded most often is "Lambda coefficient outside the default limits or the range specified by the manufacturer", which appears in 20.3% of failed Porsche Boxster 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 Boxster?: The most common advisory is "Brake pipe damaged or excessively corroded", noted on 21.2% of all Porsche Boxster tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Porsche Boxster usually have at its MOT?: The average odometer reading recorded at test is 65,952 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.
Does a Porsche Boxster get harder to pass as it ages?: Yes. At 3 to 5 years old, 94.4% of Porsche Boxster tests pass. By fifteen years or more, that falls to 77.9%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

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. The adjusted rate is directly standardised across twenty-five age and mileage bands and reweighted onto the national distribution, so this model is compared against cars that have lived a similar life rather than against a younger or lighter-used fleet.

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.