Porsche Boxster 2006: reliability & common MOT faults

At a glance

How 1,763 first tests went in 2025.

Passed first time: 82 in every 100
Did not pass first time: 18 in every 100310 failed first-attempt tests
The typical car: 19 yearsabout 74,072 miles
First tests counted: 1,763

How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.

Note:

These are patterns across 2006 Porsche Boxster vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Brakes

Two faults. The strongest is the rigid brake pipes (front): 3.7 times as often as on similar cars.

Figures below are measured across the 310 failed first attempts in 2025 that had a mileage recorded, which allows a like-for-like comparison.

We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.

Rigid brake pipes (front)

Failed on 22 first tests3.7 times as often as similar carsPossible evidence

What it means

Chafing, corrosion or damage to a rigid brake pipe justifies rejection once its wall thickness is reduced by a set amount, although DVSA accepts this is not easy to determine. If a tester is not sure, the benefit of the doubt applies. A leaking pipe or connection is graded Dangerous on a hydraulic system and Major on an air system.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 59 first tests, 3.4 times as often as on similar cars.

Rigid brake pipes (rear)

Failed on 22 first tests2.2 times as often as similar carsPossible evidence

What it means

Chafing, corrosion or damage to a rigid brake pipe justifies rejection once its wall thickness is reduced by a set amount, although DVSA accepts this is not easy to determine. If a tester is not sure, the benefit of the doubt applies. A leaking pipe or connection is graded Dangerous on a hydraulic system and Major on an air system.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage. Advisories count notes recorded on failed first tests only.

Noise, emissions and leaks

One fault: petrol emissions (with catalyst), 2.9 times as often as on similar cars.

Petrol emissions (with catalyst)

Failed on 46 first tests2.9 times as often as similar carsPossible evidence

What it means

Emissions levels over the manufacturer's specified limits are Major, as are levels over default limits, which apply when no exact match is found for the vehicle. Dense blue or clearly visible black smoke at idle, held for a set period, is Major, except for certain older vehicles and two stroke engines where smoke is unavoidable. An induction or exhaust leak that could affect emissions levels is Major too.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

Advisories

Other things testers noted as worn or close to failing, more often than on similar cars.

An advisory is a note from the tester about something that has not failed yet. It is an early warning, not a fail. Advisories for the faults above are shown with those faults.

Suspension arm ball joint (front)

Noted on 23 first tests3.7 times as often as similar carsElevated evidence

Non-component advisories (front)

Noted on 23 first tests2.5 times as often as similar carsElevated evidence

Brake discs (rear)

Noted on 42 first tests2.3 times as often as similar carsWear pattern

Data: UK MOT open data, 2025. Counts cover advisories recorded on failed first tests only, compared with cars of the same age and mileage.

MOT pass rates

How first tests ended, and how the pass rates are counted.

Passed first time: 82in every 100; Passed on the first test.
Fixed at the station: 2in every 100; Failed, then fixed at the test station the same day.
Failed: 16in every 100; Did not pass, and were not fixed at the test station.

First-attempt pass 82.4% of 1,763 first tests (2025): only cars that passed first time count. Official-style pass 84.2%: cars fixed at the test station also count as a pass. The 2 fixed and the 16 not fixed make the 18 in every 100 that did not pass first time.

Same model, other years

Passed first time in every 100, all tested in 2025.

Newer cars are younger, so look for a jump rather than the climb. A year earlier (2024), when these cars were a year younger, 80 in every 100 passed first time.

Year	Passed first time	First tests
1997	74 in every 100	352
1998	75 in every 100	684
1999	72 in every 100	958
2000	72 in every 100	1,750
2001	74 in every 100	1,917
2002	73 in every 100	1,967
2003	73 in every 100	2,260
2004	76 in every 100	1,901
2005	80 in every 100	3,065
2006 This car	82 in every 100	1,763
2007	84 in every 100	1,524
2008	86 in every 100	1,027
2009	88 in every 100	816
2010	89 in every 100	779
2011	88 in every 100	743
2012	90 in every 100	1,061
2013	92 in every 100	1,219
2014	91 in every 100	1,156
2015	91 in every 100	1,033
2016	94 in every 100	1,173
2017	92 in every 100	940
2018	94 in every 100	962
2019	94 in every 100	850
2020	93 in every 100	425
2021	96 in every 100	336

FAQs

Short answers about how to read this model-year guide.

Is the 2006 Porsche Boxster reliable?

The 2006 Porsche Boxster follows the pattern of the model years either side. In 2025, 82.4% of 1,763 first MOTs on the 2006 Porsche Boxster passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 84.2%. Among 310 failed first-attempt MOT tests (test year 2025), Rigid brake pipes (front) appears more often than on similar cars (7.1% of those tests; 22 observed failures; about 3.7× more often than similar cars). There is no single reliability score here; this is a pre-purchase checklist built from DVSA open data, not a guarantee for any individual car.

What common MOT faults stand out on the Porsche Boxster 2006?

Among failed first-attempt tests we highlight patterns that appear more often than on similar cars. Top example: Rigid brake pipes (front) (7.1% of those tests; 22 observed failures; about 3.7× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.

Why does Rigid brake pipes (front) stand out?

Rigid brake pipes (front) shows up more often than on similar cars (7.1% of those tests; 22 observed failures; about 3.7× more often than similar cars). That does not prove a design fault. Age, mileage, and how the car was used still matter. Treat it as a pre-purchase checkpoint, not a manufacturer service bulletin.

What are common problems with the 2006 Porsche Boxster?

Common MOT problem areas for the 2006 Porsche Boxster include Rigid brake pipes (front), Petrol emissions (with catalyst). These are the faults that stand out compared with similar cars, not a complete list of what can go wrong on any individual car.

How should I read advisories vs fails?

Advisories flag issues noted at the test and are not a fail rate. We show advisory patterns that appear more often than on similar cars among failed first-attempt tests, separate from common failure rows. Use them as early-warning checks, not as a pass/fail score.

What does this Porsche Boxster 2006 MOT report cover?

This page highlights MOT failure patterns for the 2006 Porsche Boxster (registration year) using UK DVSA open data for the selected test year. Patterns are compared with cars of a similar age and mileage. It is a buyer checklist from MOT defect statistics, not a full service history or manufacturer service-bulletin list.

Does this include engine and gearbox problems?

No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.

About this data

How this page is built and what it can (and can't) say.

These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.

2024 2025

What we include

UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.

Same-day repairs

PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

How we compare

We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.

What this does not cover

MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
If the data for a car is too thin to say anything useful, we say so rather than guess.

Contains public sector information licensed under the Open Government Licence v3.0.

At a glance

Brakes

Rigid brake pipes (front)

What it means

Also noted as an advisory

Rigid brake pipes (rear)

What it means

Noise, emissions and leaks

Petrol emissions (with catalyst)

What it means

Advisories

Suspension arm ball joint (front)

Non-component advisories (front)

Brake discs (rear)

MOT pass rates

Same model, other years

FAQs

About this data

What we include

Same-day repairs

How we compare

What this does not cover

Check any vehicle’s MOT history