BMW 4 Series 2018: MOT failure rate for its age

12.5% of 64,988 MOT tests of the BMW 4 Series first registered in 2018 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 98.9 (95% CI 96.7–101.0; 100 = normal for this model at that age): the 2018 build year is no different from other years of the same model at the same age.

BMW 4 Series built in 2018 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	12.5	%	all ages tested	2019–2024	64988
Index against this model at the same age (95% CI 96.7–101.0)	98.9	index	100 = normal for this model at that age	2019–2024	64988
Rank among this model's 8 build years	2	of 8	1 = fails least for its age	2019–2024	64988
Tested in 2024	15674	tests	median 47,506 miles	2024	15674

Built 2018 against BMW 4 Series normal for the age: first-time MOT failure share at each age, age 3: 11.8% vs 11.5%; age 4: 11% vs 11.9%; age 5: 12.9% vs 13.2%; age 6: 14.4% vs 14.1%. Axis from 0% to 20%. DVSA MOT bulk data, 2019–2024.

Check a 2018 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 2018 BMW 4 Series fail at each age?

Cars built in 2018 were tested at ages 3 to 6 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 2018: 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)
3	17,009	11.8	11.3–12.3	11.5	102.7
4	16,437	11	10.6–11.5	11.9	92.8
5	15,868	12.9	12.4–13.4	13.2	97.6
6	15,674	14.4	13.9–15	14.1	101.9

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 64,988 (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 2018 BMW 4 Series?

The most common failure group on cars built in 2018 is tyres: 10.5 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 2018 were tested at ages 3 to 6.

Failure items per 100 first tests, BMW 4 Series built 2018 against the BMW 4 Series in all build years (2019–2024, not age-adjusted)
Failure group	Built 2018, per 100	All build years, per 100	Items
Tyres	10.5	10.9	6,882
Visibility	3.3	4	2,186
Brakes	1.8	2.7	1,152
Lamps, reflectors and electrical equipment	1.2	2.2	803
Road Wheels	0.7	0.9	486

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 65,640 (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 2018 compare with the years around it?

Among the 8 published build years of the BMW 4 Series, 2018 ranks 2 (1 = fails least for its age). 2017: index 94.1. 2019: index 110.7.

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 2018 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/2018/

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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