Performance by cohort

3 year bands · 74,985 tests

Pass rate climbs 12.3 points across the cohorts — newer Boxster examples clear the test more reliably than the early cars.

Pre-2018 cohort 68,487

Pass

85.4%

Fail

11.8%

PRS

2.3%

Avg mileage at test

68,846 mi

2018–2020 cohort 5,744

Pass

96.1%

Fail

2.7%

PRS

1.0%

Avg mileage at test

22,068 mi

2021+ cohort 754

Pass

97.8%

Fail

1.6%

PRS

0.5%

Avg mileage at test

12,666 mi

Cohort = vehicle's first-registration year band. Same model, different generations of build.

Generations on file · 4

Porsche Boxster · UK market

Photos: Wikimedia Commons · CC BY-SA / CC BY / public domain.

The picture

Porsche Boxster: solid MOT record across 37,183 tests

The Porsche Boxster is a petrol-powered car sold in the UK market across multiple generations, covering a broad date range in the test population.

MOT data from 37,183 tests puts this car on a 83.4% first-time pass rate, above the UK fleet average. Average mileage at test is 65,678 miles. The most common fail item is brake pipe damaged or excessively corroded, followed by lambda coefficient outside the default limits or the range specified by the manufacturer.

Honest John owner records point to gearbox noise or CVT reliability as the recurring problems to check before buying used.

For used buyers, the Boxster's pass rate suggests it clears the MOT with fewer surprises than most — but the top failure items above are still worth a pre-purchase inspection, particularly on higher-mileage examples.

ABI Insurance Group

Group 38–48

A high-group car — insurance costs will be significantly above average. Lower groups cost less to insure; UK fleet average is around Group 22.

Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →

38–48

out of 50

Compare quotes →

Top ten reasons for rejection.

Filter failures:

Hide wear items to see the model's real defects.

01

Brake pipe damaged or excessively corroded

1,312 occurrences · 1.7% of tests
02

Lambda coefficient outside the default limits or the range specified by the manufacturer

1,309 occurrences · 1.7% of tests
03

Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view

1,105 occurrences · 1.5% of tests
04

Headlamp reflector or lens slightly defective

1,018 occurrences · 1.4% of tests
05

A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources

836 occurrences · 1.1% of tests
06

A spring or spring component fractured or seriously weakened

819 occurrences · 1.1% of tests
07

A transmission shaft constant velocity joint boot severely deteriorated

765 occurrences · 1.0% of tests
08

Tyre tread depth not in accordance with the requirements

675 occurrences · 0.9% of tests
09

The aim of a headlamp is not within limits laid down in the requirements

541 occurrences · 0.7% of tests
10

A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

492 occurrences · 0.7% 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 3 failures

£58–£205

If every one of this Boxster'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 →

Try the calculator

Build your own retest budget.

Year-band analysis

Best year to buy. Worst to avoid.

First-time MOT pass rate split by registration band. A 12.3-point gap between bands means the year you buy Porsche Boxster has a real effect on what turns up at the garage.

Best band to buy

97.8%

2021+ registration

the 2021-on band climbs to 97.8% — a 12.3-point improvement. Tests in this band average 12,666 miles — roughly 56K miles fewer on the clock than the older band. Failures here are mostly wear items: damaged but not adversely affecting driver's view, has a cut in excess of the… — the structural issues that drag down older examples don't appear in the top-10 for this band. Post-2020 examples are early in their MOT life and generally show the cleanest records.

Band to be cautious about

85.4%

Pre-2018 registration

On the older band (pre-2018), the data shows a 85.4% pass rate against a fleet average of 97.8% on the newer band. The main culprits logged at test: excessively corroded, lambda reading after 2nd fast idle outside…, and damaged but not adversely affecting driver's view. Average mileage on test for this band is 68,846 miles — high-mileage wear items are a recurring theme.

Best band to buy: 2021+ (97.8% first-time pass). Worst band to avoid: pre-2018 (85.4% pass). That's a 12.3-point spread across 68,487 older tests and 754 newer ones — year of build makes a material difference on this model.

Year-spread leaderboard →

Tools that pre-empt a retest.

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.

Item 01 · Amazon UK

Headlight restoration kit

Yellowed lenses fail the light-output test. A restoration kit lifts the haze in an afternoon for £20.

Search Amazon UK

Item 02 · Amazon UK

H7 / W21W bulb pack

A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.

Search Amazon UK

My Motor World · affiliate

Parts & supplies for this fix

Affiliate links — small commission, no extra cost to you.

Draper Expert

Draper Expert Oil Filter Socket for Audi, BMW, Mercedes-Benz, Porsche and VW

£18.69

View at My Motor World →

My Motor World

Porsche Birthday Greetings Card (Personalised)

£4.28

View at My Motor World →

Motor World

Motor World Porsche Cayenne 2003-2012 Car Floor Mat Set

£32.99

View at My Motor World →

Motor World

Motor World Porsche 911 Coupe 2004-, Cabriolet 2005- & Targe 2006- Car Floor Mat Set

£32.99

View at My Motor World →

Click Mechanic · affiliate

Book a mobile mechanic

Affiliate links — small commission, no extra cost to you.

Mobile mechanic · UK-wide

Book a mechanic at your door.

Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.

Get a quote →

Owner reports · Honest John

What owners actually report.

Verbatim faults logged by owners on honestjohn.co.uk over recent years. We didn't summarise — these are the words people typed in.

What's good

This Boxster is lighter and more economical than its predecessor. Claimed 36mpg. Good looking interior. Even better to drive than before.

Recent owner-reported faults

4 May 2019
2014 Porsche Boxster 2.7 PDK entry model needed new transmission at 18,000 miles.
26 Feb 2015
Late model Porsche ECUs record how the car has been used, in particular if it has ever been over-revved. So vital to see a readout of an interrogation of the ECU before buying a used Boxster.

Source: honestjohn.co.uk · 2 reports indexed

Recall history

9 UK recalls on record.

The Boxster has 9 official UK vehicle recalls covering defect details, remedies, and affected build dates.

See all recalls

Buying or keeping a Boxster?

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 Boxster 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.