Does the BMW M4 fail the MOT on noise, emissions and leaks more than it should?

The BMW M4 records 0.91 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 1.08 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 −0.26 to −0.09). It ranks 297 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 M4 by registration

What exactly fails on noise, emissions and leaks?

The most frequent DVSA defect wording in this group on the BMW M4 is “Lambda coefficient outside the default limits or the range specified by the manufacturer”, recorded 114 times in 2019–2024.

BMW M4: most frequent noise, emissions and leaks defect wordings, 2019–2024 (30+ items each)
DVSA defect wording	Items	Per 100 tests
Lambda coefficient outside the default limits or the range specified by the manufacturer	114	0.20
Emissions levels exceed default limits	113	0.20
Engine MIL illuminated indicating a malfunction	106	0.19
Emissions levels exceed the manufacturer's specified limits	76	0.13
Emission control equipment fitted by the manufacturer missing, obviously modified or obviously defective	57	0.10

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 57,282 (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

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Does the BMW M4 fail the MOT on noise, emissions and leaks more than it should?

What exactly fails on noise, emissions and leaks?

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