Does the Vauxhall Signum fail the MOT on noise, emissions and leaks more than it should?
The Vauxhall Signum records 10.05 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 7.89 expected for a car of the same age mix: more than expected for its class and age (+2.16, 95% interval +1.68 to +2.63). It ranks 86 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 Vauxhall Signum by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Vauxhall Signum is “Engine MIL illuminated indicating a malfunction”, recorded 455 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Engine MIL illuminated indicating a malfunction | 455 | 2.67 |
| Emissions levels exceed default limits | 244 | 1.43 |
| Smoke opacity levels exceed the manufacturer's specified limit | 234 | 1.37 |
| Emissions test unable to be completed | 183 | 1.07 |
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 161 | 0.95 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 17,028 (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 Vauxhall Signum gets a noise, emissions and leaks advisory, how often does it fail next time?
9.6% of Vauxhall Signum 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 4,099 miles later (1,173 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 1,173 (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
Vauxhall Signum 2003 · Vauxhall Signum 2004 · Vauxhall Signum 2005 · Vauxhall Signum 2006 · Vauxhall Signum 2007 · Vauxhall Signum by postcode area · Vauxhall Signum body, chassis and structure failures · Vauxhall Signum brakes failures · Vauxhall Signum vehicle identification failures · Vauxhall Signum lamps, reflectors and electrics failures · Vauxhall Signum road wheels failures · Vauxhall Signum seat belts and airbags failures · Vauxhall Signum steering failures · Vauxhall Signum suspension failures · Vauxhall Signum tyres failures · Vauxhall Signum visibility failures