Does the Mazda 323 fail the MOT on noise, emissions and leaks more than it should?
The Mazda 323 records 9.47 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 9.77 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) (−0.30, 95% interval −0.77 to +0.18). It ranks 324 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 Mazda 323 by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Mazda 323 is “Emissions levels exceed default limits”, recorded 434 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Emissions levels exceed default limits | 434 | 2.58 |
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 304 | 1.81 |
| Engine MIL illuminated indicating a malfunction | 287 | 1.71 |
| Emissions levels exceed the manufacturer's specified limits | 188 | 1.12 |
| Emissions test unable to be completed | 160 | 0.95 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 16,804 (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 Mazda 323 gets a noise, emissions and leaks advisory, how often does it fail next time?
10.0% of Mazda 323 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 2,581 miles later (1,456 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 1,456 (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
Mazda 323 1999 · Mazda 323 2000 · Mazda 323 2001 · Mazda 323 2002 · Mazda 323 2003 · Mazda 323 in Norway · Mazda 323 in the Netherlands · Mazda 323 by postcode area · Mazda 323 body, chassis and structure failures · Mazda 323 brakes failures · Mazda 323 vehicle identification failures · Mazda 323 lamps, reflectors and electrics failures · Mazda 323 road wheels failures · Mazda 323 seat belts and airbags failures · Mazda 323 steering failures · Mazda 323 suspension failures · Mazda 323 tyres failures · Mazda 323 visibility failures