Does the Porsche Cayman fail the MOT on noise, emissions and leaks more than it should?
The Porsche Cayman records 1.66 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 3.81 expected for a car of the same age mix: less than expected for its class and age (−2.15, 95% interval −2.29 to −2.01). It ranks 554 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 Cayman by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Porsche Cayman is “Lambda coefficient outside the default limits or the range specified by the manufacturer”, recorded 588 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 588 | 0.75 |
| Engine MIL illuminated indicating a malfunction | 260 | 0.33 |
| Emissions levels exceed default limits | 144 | 0.18 |
| Emissions test unable to be completed | 99 | 0.13 |
| Emissions levels exceed the manufacturer's specified limits | 78 | 0.10 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 78,380 (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 Cayman gets a noise, emissions and leaks advisory, how often does it fail next time?
4.7% of Porsche Cayman MOTs with a noise, emissions and leaks advisory were followed by a fail in the same group at the next MOT, typically 12.2 months and 2,797 miles later (1,163 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 1,163 (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
Porsche Cayman 2005 · Porsche Cayman 2006 · Porsche Cayman 2007 · Porsche Cayman 2008 · Porsche Cayman 2009 · Porsche Cayman 2010 · Porsche Cayman 2011 · Porsche Cayman 2012 · Porsche Cayman 2013 · Porsche Cayman 2014 · Porsche Cayman 2015 · Porsche Cayman 2016 · Porsche Cayman 2017 · Porsche Cayman 2018 · Porsche Cayman 2019 · Porsche Cayman 2020 · Porsche Cayman in the Netherlands · Porsche Cayman by postcode area · Porsche Cayman body, chassis and structure failures · Porsche Cayman brakes failures · Porsche Cayman vehicle identification failures · Porsche Cayman lamps, reflectors and electrics failures · Porsche Cayman road wheels failures · Porsche Cayman seat belts and airbags failures · Porsche Cayman steering failures · Porsche Cayman suspension failures · Porsche Cayman tyres failures · Porsche Cayman visibility failures