Does the Daihatsu Copen fail the MOT on noise, emissions and leaks more than it should?
The Daihatsu Copen records 7.78 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 7.74 expected for a car of the same age mix: about as expected for its class and age (the difference is within its interval or under 0.5 items per 100 tests) (+0.04, 95% interval −0.54 to +0.63). It ranks 252 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 Daihatsu Copen by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Daihatsu Copen is “Lambda coefficient outside the default limits or the range specified by the manufacturer”, recorded 201 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 201 | 2.33 |
| Engine MIL illuminated indicating a malfunction | 141 | 1.63 |
| Emissions levels exceed default limits | 114 | 1.32 |
| Emissions test unable to be completed | 83 | 0.96 |
| Emissions levels exceed the manufacturer's specified limits | 70 | 0.81 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 8,632 (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
Other pages for this model
Daihatsu Copen by postcode area · Daihatsu Copen body, chassis and structure failures · Daihatsu Copen brakes failures · Daihatsu Copen vehicle identification failures · Daihatsu Copen lamps, reflectors and electrics failures · Daihatsu Copen seat belts and airbags failures · Daihatsu Copen steering failures · Daihatsu Copen suspension failures · Daihatsu Copen tyres failures · Daihatsu Copen visibility failures