Does the Triumph Stag fail the MOT on noise, emissions and leaks more than it should?
The Triumph Stag records 3.33 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 7.32 expected for a car of the same age mix: less than expected for its class and age (−3.99, 95% interval −4.56 to −3.43). It ranks 642 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 Triumph Stag by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Triumph Stag is “Emissions levels exceed default limits”, recorded 207 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Emissions levels exceed default limits | 207 | 2.35 |
| Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users | 52 | 0.59 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 8,805 (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 Triumph Stag gets a noise, emissions and leaks advisory, how often does it fail next time?
4.6% of Triumph Stag 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 858 miles later (788 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 788 (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
Triumph Stag by postcode area · Triumph Stag body, chassis and structure failures · Triumph Stag brakes failures · Triumph Stag lamps, reflectors and electrics failures · Triumph Stag seat belts and airbags failures · Triumph Stag steering failures · Triumph Stag suspension failures · Triumph Stag tyres failures · Triumph Stag visibility failures