Does the BMW 3 Series fail the MOT on noise, emissions and leaks more than it should?

The BMW 3 Series records 3.47 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 4.54 expected for a car of the same age mix: less than expected for its class and age (−1.07, 95% interval −1.09 to −1.04). It ranks 447 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 BMW 3 Series by registration

What exactly fails on noise, emissions and leaks?

The most frequent DVSA defect wording in this group on the BMW 3 Series is “Engine MIL illuminated indicating a malfunction”, recorded 32,708 times in 2019–2024.

BMW 3 Series: most frequent noise, emissions and leaks defect wordings, 2019–2024 (30+ items each)
DVSA defect wording	Items	Per 100 tests
Engine MIL illuminated indicating a malfunction	32,708	1.05
Emissions levels exceed default limits	18,479	0.59
Lambda coefficient outside the default limits or the range specified by the manufacturer	16,883	0.54
Emissions test unable to be completed	9,638	0.31
Emissions levels exceed the manufacturer's specified limits	9,089	0.29

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 3,110,401 (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 BMW 3 Series gets a noise, emissions and leaks advisory, how often does it fail next time?

7.5% of BMW 3 Series 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 4,323 miles later (149,855 advisories followed).

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 149,855 (advisories followed) · Method: the same vehicles followed to their next ordinary MOT · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

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Does the BMW 3 Series fail the MOT on noise, emissions and leaks more than it should?

What exactly fails on noise, emissions and leaks?

If a BMW 3 Series gets a noise, emissions and leaks advisory, how often does it fail next time?

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Other pages for this model