Does the Mercedes-Benz GLA fail the MOT on noise, emissions and leaks more than it should?
The Mercedes-Benz GLA records 0.82 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 0.99 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) (−0.17, 95% interval −0.20 to −0.14). It ranks 296 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 Mercedes-Benz GLA by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Mercedes-Benz GLA is “Engine MIL illuminated indicating a malfunction”, recorded 2,581 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Engine MIL illuminated indicating a malfunction | 2,581 | 0.73 |
| Emissions test unable to be completed | 71 | 0.02 |
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 71 | 0.02 |
| Emissions levels exceed default limits | 33 | 0.01 |
| Smoke opacity levels exceed the manufacturer's specified limit | 30 | 0.01 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 353,008 (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 Mercedes-Benz GLA gets a noise, emissions and leaks advisory, how often does it fail next time?
2.3% of Mercedes-Benz GLA MOTs with a noise, emissions and leaks advisory were followed by a fail in the same group at the next MOT, typically 11.9 months and 7,063 miles later (565 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 565 (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
Mercedes-Benz GLA 2014 · Mercedes-Benz GLA 2015 · Mercedes-Benz GLA 2016 · Mercedes-Benz GLA 2017 · Mercedes-Benz GLA 2018 · Mercedes-Benz GLA 2019 · Mercedes-Benz GLA 2020 · Mercedes-Benz GLA in Norway · Mercedes-Benz GLA in Finland · Mercedes-Benz GLA in the Netherlands · Mercedes-Benz GLA by postcode area · Mercedes-Benz GLA body, chassis and structure failures · Mercedes-Benz GLA brakes failures · Mercedes-Benz GLA vehicle identification failures · Mercedes-Benz GLA lamps, reflectors and electrics failures · Mercedes-Benz GLA road wheels failures · Mercedes-Benz GLA seat belts and airbags failures · Mercedes-Benz GLA steering failures · Mercedes-Benz GLA suspension failures · Mercedes-Benz GLA tyres failures · Mercedes-Benz GLA visibility failures