Mazda CX-3 2015: MOT failure rate for its age

16.4% of 14,269 MOT tests of the Mazda CX-3 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 106.5 (95% CI 102.2–110.8; 100 = normal for this model at that age): the 2015 Mazda CX-3 fails more often than other build years of the same model at the same age.

Mazda CX-3 built in 2015 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	16.4	%	all ages tested	2019–2024	14269
Index against this model at the same age (95% CI 102.2–110.8)	106.5	index	100 = normal for this model at that age	2019–2024	14269
Rank among this model's 5 build years	4	of 5	1 = fails least for its age	2019–2024	14269
Tested in 2024	2380	tests	median 58,358 miles	2024	2380

Built 2015 against Mazda CX-3 normal for the age: first-time MOT failure share at each age, age 4: 10.6% vs 10.2%; age 5: 14.8% vs 12.2%; age 6: 16.6% vs 13.9%; age 7: 16.5% vs 16.2%; age 8: 18% vs 18.8%; age 9: 21.6% vs 20.9%. Axis from 0% to 30%. DVSA MOT bulk data, 2019–2024.

Check a 2015 Mazda CX-3 by registration · All Mazda CX-3 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 Mazda CX-3 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.

Mazda CX-3 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	2,391	10.6	9.5–11.9	10.2	103.7
5	2,339	14.8	13.4–16.3	12.2	120.9
6	2,373	16.6	15.2–18.2	13.9	120.2
7	2,392	16.5	15.1–18.1	16.2	102
8	2,394	18	16.5–19.6	18.8	95.9
9	2,380	21.6	20–23.3	20.9	103.5

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 14,269 (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 Mazda CX-3?

The most common failure group on cars built in 2015 is visibility: 5.9 items per 100 first tests, against 5.7 across all build years of the Mazda CX-3. These counts are not age-adjusted: cars built in 2015 were tested at ages 4 to 9.

Failure items per 100 first tests, Mazda CX-3 built 2015 against the Mazda CX-3 in all build years (2019–2024, not age-adjusted)
Failure group	Built 2015, per 100	All build years, per 100	Items
Visibility	5.9	5.7	837
Suspension	5.5	2.2	786
Tyres	5.3	4.6	750
Brakes	4.3	3.1	615
Seat belts and supplementary restraint systems	3.5	1.2	499

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 14,269 (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 5 published build years of the Mazda CX-3, 2015 ranks 4 (1 = fails least for its age). 2016: index 113.0.

Mazda CX-3 build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2015	106.5	102.2–110.8	worse	14,269
2016	113.0	109.7–116.4	worse	29,618
2017	92.1	88.6–95.6	better	25,347
2018	93.5	89.6–97.4	better	22,725
2019	100.1	95.8–104.3	no different	22,988

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 114,947 (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). Mazda CX-3 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/mazda-cx-3/2015/

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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