Does the Porsche Boxster fail the MOT on noise, emissions and leaks more than it should?
The Porsche Boxster records 5.10 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 7.04 expected for a car of the same age mix: less than expected for its class and age (−1.94, 95% interval −2.06 to −1.83). It ranks 542 of 678 models on noise, emissions and leaks (1 = most failures above expected).
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on noise, emissions and leaks · check a Porsche Boxster by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Porsche Boxster is “Lambda coefficient outside the default limits or the range specified by the manufacturer”, recorded 5,196 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 5,196 | 2.67 |
| Engine MIL illuminated indicating a malfunction | 1,257 | 0.65 |
| Emissions levels exceed default limits | 1,211 | 0.62 |
| Emissions test unable to be completed | 782 | 0.40 |
| Emissions levels exceed the manufacturer's specified limits | 604 | 0.31 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 194,725 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
If a Porsche Boxster gets a noise, emissions and leaks advisory, how often does it fail next time?
9.3% of Porsche Boxster MOTs with a noise, emissions and leaks advisory were followed by a fail in the same group at the next MOT, typically 12.1 months and 1,551 miles later (6,741 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 6,741 (advisories followed) · Method: the same vehicles followed to their next ordinary MOT · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
Other pages for this model
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