BMW 4 Series 2015: MOT failure rate for its age

15.7% of 111,935 MOT tests of the BMW 4 Series first registered in 2015 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 102.0 (95% CI 100.5–103.5; 100 = normal for this model at that age): close to other build years of the same model at the same age (within 5 points of normal).

BMW 4 Series built in 2015 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	15.7	%	all ages tested	2019–2024	111935
Index against this model at the same age (95% CI 100.5–103.5)	102.0	index	100 = normal for this model at that age	2019–2024	111935
Rank among this model's 8 build years	5	of 8	1 = fails least for its age	2019–2024	111935
Tested in 2024	18247	tests	median 77,586 miles	2024	18247

Built 2015 against BMW 4 Series normal for the age: first-time MOT failure share at each age, age 4: 13.1% vs 13.4%; age 5: 14.3% vs 13.7%; age 6: 14.8% vs 14.6%; age 7: 16.3% vs 15.5%; age 8: 17% vs 16.6%; age 9: 18.8% vs 18.6%. Axis from 0% to 20%. DVSA MOT bulk data, 2019–2024.

Check a 2015 BMW 4 Series by registration · All BMW 4 Series MOT statistics · Download the build-year table (CSV)

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).

How does the 2015 BMW 4 Series fail at each age?

Cars built in 2015 were tested at ages 4 to 9 between 2019 and 2024. Each row compares their first-time failure share with what this model normally shows at that age, after allowing for the overall failure level of each test year.

BMW 4 Series built 2015: first-time MOT failure by age, against the model's normal rate at that age (2019–2024)
Age	Tests	Failed, %	95% interval	Normal for this model at that age, %	Index (100 = normal)
4	19,715	13.1	12.7–13.6	13.4	98.2
5	18,105	14.3	13.8–14.8	13.7	104.3
6	18,795	14.8	14.3–15.3	14.6	101.3
7	18,641	16.3	15.8–16.8	15.5	104.9
8	18,432	17	16.5–17.6	16.6	102.5
9	18,247	18.8	18.3–19.4	18.6	100.9

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 111,935 (initial tests) · Method: normal rate = this model's first-time failure share at that age across its build years (cells of 400+ tests), adjusted for each test year's overall level; cells of 30+ tests, under 500 marked rough · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

What fails most on the 2015 BMW 4 Series?

The most common failure group on cars built in 2015 is tyres: 11.3 items per 100 first tests, against 10.9 across all build years of the BMW 4 Series. These counts are not age-adjusted: cars built in 2015 were tested at ages 4 to 9.

Failure items per 100 first tests, BMW 4 Series built 2015 against the BMW 4 Series in all build years (2019–2024, not age-adjusted)
Failure group	Built 2015, per 100	All build years, per 100	Items
Tyres	11.3	10.9	12,663
Visibility	4.4	4	4,924
Brakes	3.5	2.7	3,868
Lamps, reflectors and electrical equipment	2.8	2.2	3,184
Suspension	1.7	1.4	1,878

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 111,935 (initial tests of this build year) · Method: failure items grouped by DVSA's top-level defect groups, per 100 initial tests; groups with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How does 2015 compare with the years around it?

Among the 8 published build years of the BMW 4 Series, 2015 ranks 5 (1 = fails least for its age). 2014: index 106.5. 2016: index 99.3.

BMW 4 Series build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2013	100.8	96.1–105.5	no different	9,750
2014	106.5	104.7–108.2	worse	77,602
2015	102.0	100.5–103.5	worse	111,935
2016	99.3	97.8–100.9	no different	114,125
2017	94.1	92.4–95.9	better	94,393
2018	98.9	96.7–101.0	no different	64,988
2019	110.7	107.4–114.0	worse	32,125
2020	102.1	96.2–108.1	no different	9,576

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 514,494 (initial tests) · Method: observed failures against those expected for the same model at the same ages, test-year level adjusted; verdict follows the printed one-decimal bound · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How to cite this page

MOT Risk Index (2026). BMW 4 Series 2015 MOT statistics (data release dvsa-2024-v2; full dataset motriskindex-families-2024-v5, DOI 10.5281/zenodo.22975051), updated 30 September 2026. motriskindex.co.uk/cars/bmw-4-series/2015/

How every figure is calculated: methodology. Age, test year and build year are tied together (age = test year − build year), so the test-year level is taken as observed, not estimated.

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