MOT failure data · 2025
Porsche Boxster MOT problems
Across every Porsche Boxster that failed its 2025 MOT, the defect testers recorded most often was catalyst emissions lambda reading after 2nd fast idle outside specified limits, on 8.45% of failure items. The broadest problem area was lamps, reflectors and electrical equipment at 22.34%. These are recorded defects across the model, not a diagnosis of any one car.
Most common Porsche Boxster MOT failures
| # | Recorded defect | Area | Share |
|---|---|---|---|
| 1 | Catalyst emissions lambda reading after 2nd fast idle outside specified limits | Noise, emissions and leaks | 8.45% |
| 2 | Rigid brake pipes excessively corroded | Brakes | 6.46% |
| 3 | Coil spring fractured or broken | Suspension | 4.8% |
| 4 | Tread depth tread depth below requirements of 1.6mm | Tyres | 3.67% |
| 5 | Headlamp aim projected beam image is obviously incorrect | Lamps, reflectors and electrical equipment | 3.24% |
| 6 | Wipers does not clear the windscreen effectively | Visibility | 2.81% |
| 7 | Position lamp not working | Lamps, reflectors and electrical equipment | 2.65% |
| 8 | Joints constant velocity boot split or insecure, no longer prevents the ingress of dirt | Body, chassis, structure | 2.49% |
| 9 | Headlamp not working on dipped beam | Lamps, reflectors and electrical equipment | 2.36% |
| 10 | Ball joint ball joint excessively worn | Suspension | 2.32% |
Shares are of all recorded failure items for this model, so they sum to less than 100% — a single failed test often records several defects, and the long tail below the top 10 is not shown.
What this means if you are buying one
Use it as a viewing checklist. If you are looking at a Porsche Boxster, these are the areas worth inspecting and worth asking about — and worth reading the car's own MOT history for, since a defect that keeps reappearing as an advisory is a better signal than any model-wide average.
The MOT record also has hard limits: it does not check the engine, clutch or gearbox, and it says nothing about outstanding finance, insurance write-off history, stolen markers or whether the mileage is genuine. Our used Porsche Boxster buying guide covers what to check beyond the MOT.
Checking a specific Porsche Boxster?
Enter its registration for finance, write-off, stolen, mileage and keeper history.
Other Porsche models
- Porsche 911 MOT problems
- Porsche Macan MOT problems
- Porsche Cayenne MOT problems
- Porsche Cayman MOT problems
- Porsche Taycan MOT problems
- Porsche Panamera MOT problems
Porsche Boxster MOT FAQs
What does a Porsche Boxster most commonly fail its MOT on?
The single most recorded defect on Porsche Boxster cars failing their 2025 MOT was "catalyst emissions lambda reading after 2nd fast idle outside specified limits", appearing on 8.45% of failure items.
Does this mean my Porsche Boxster will fail?
No. This is what testers recorded across every Porsche Boxster that failed in 2025. It shows where this model tends to need attention, not the condition of any individual car. The Porsche Boxster passed 85.19% of its initial tests.
How do I see a specific Porsche Boxster's MOT history?
Enter its registration on our free MOT history check to see that car's own test results, advisories and recorded mileages.
See also: Porsche Boxster MOT pass rate · used Porsche Boxster buying guide · free MOT history check
Defect counts from the DVSA MOT Anonymised test-item data for 2025 (class 4 initial tests, failure items only — advisories and minor defects excluded), licensed under the Open Government Licence v3.0.