Does the Triumph Stag fail the MOT on body, chassis and structure more than it should?
The Triumph Stag records 4.55 body, chassis and structure failure items per 100 initial MOT tests (2019–2024), against 15.09 expected for a car of the same age mix: less than expected for its class and age (−10.54, 95% interval −11.35 to −9.72). It ranks 631 of 663 models on body, chassis and structure (1 = most failures above expected).
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on body, chassis and structure · check a Triumph Stag by registration
What exactly fails on body, chassis and structure?
The most frequent DVSA defect wording in this group on the Triumph Stag is “Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced”, recorded 101 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced | 101 | 1.15 |
| A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc | 48 | 0.55 |
| Body, cab or chassis excessively corroded at a mounting point | 47 | 0.53 |
| Fuel system leaking, or missing or ineffective filler cap | 42 | 0.48 |
| A transmission shaft constant velocity joint boot severely deteriorated | 38 | 0.43 |
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
Other pages for this model
Triumph Stag by postcode area · Triumph Stag brakes failures · Triumph Stag lamps, reflectors and electrics failures · Triumph Stag noise, emissions and leaks failures · Triumph Stag seat belts and airbags failures · Triumph Stag steering failures · Triumph Stag suspension failures · Triumph Stag tyres failures · Triumph Stag visibility failures