Citroen C4 Cactus 2018: MOT failure rate for its age

19.9% of 21,689 MOT tests of the Citroen C4 Cactus 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 97.8 (95% CI 94.9–100.7; 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.

Citroen C4 Cactus built in 2018 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	19.9	%	all ages tested	2019–2024	21689
Index against this model at the same age (95% CI 94.9–100.7)	97.8	index	100 = normal for this model at that age	2019–2024	21689
Rank among this model's 6 build years	3	of 6	1 = fails least for its age	2019–2024	21689
Tested in 2024	5384	tests	median 42,078 miles	2024	5384

Built 2018 against Citroen C4 Cactus normal for the age: first-time MOT failure share at each age, age 3: 13.7% vs 14.1%; age 4: 17.3% vs 18.1%; age 5: 23.1% vs 23.4%; age 6: 25.8% vs 26%. Axis from 0% to 30%. DVSA MOT bulk data, 2019–2024.

Check a 2018 Citroen C4 Cactus by registration · All Citroen C4 Cactus 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 Citroen C4 Cactus 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.

Citroen C4 Cactus 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	5,488	13.7	12.8–14.6	14.1	97
4	5,431	17.3	16.3–18.3	18.1	95.6
5	5,386	23.1	22–24.2	23.4	98.6
6	5,384	25.8	24.6–27	26	99.1

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 21,689 (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 Citroen C4 Cactus?

The most common failure group on cars built in 2018 is visibility: 10.1 items per 100 first tests, against 10.8 across all build years of the Citroen C4 Cactus. These counts are not age-adjusted: cars built in 2018 were tested at ages 3 to 6.

Failure items per 100 first tests, Citroen C4 Cactus built 2018 against the Citroen C4 Cactus in all build years (2019–2024, not age-adjusted)
Failure group	Built 2018, per 100	All build years, per 100	Items
Visibility	10.1	10.8	2,209
Lamps, reflectors and electrical equipment	7.3	9.3	1,589
Tyres	5.9	6.7	1,281
Brakes	4.4	4.9	962
Body, chassis, structure	2.7	4.1	581

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 21,892 (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 6 published build years of the Citroen C4 Cactus, 2018 ranks 3 (1 = fails least for its age). 2017: index 101.1. 2019: index 95.8.

Citroen C4 Cactus build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2015	111.1	100.8–121.4	worse (rough estimate)	1,395
2016	113.1	110.2–116.0	worse	20,569
2017	101.1	98.7–103.5	no different	30,726
2018	97.8	94.9–100.7	no different	21,689
2019	95.8	91.8–99.9	better	11,989
2020	75.9	68.9–82.8	better (rough estimate)	3,831

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 90,199 (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). Citroen C4 Cactus 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/citroen-c4-cactus/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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