Does the Mercedes-Benz 420 fail the MOT on noise, emissions and leaks more than it should?
The Mercedes-Benz 420 records 3.67 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 (−3.65, 95% interval −4.57 to −2.72). It ranks 633 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 420 by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Mercedes-Benz 420 is “Emissions levels exceed default limits”, recorded 68 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Emissions levels exceed default limits | 68 | 2.05 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 3,320 (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
Mercedes-Benz 420 by postcode area · Mercedes-Benz 420 body, chassis and structure failures · Mercedes-Benz 420 brakes failures · Mercedes-Benz 420 lamps, reflectors and electrics failures · Mercedes-Benz 420 steering failures · Mercedes-Benz 420 suspension failures · Mercedes-Benz 420 tyres failures · Mercedes-Benz 420 visibility failures