Infiniti Q50 2015: MOT failure rate for its age

20.5% of 4,733 MOT tests of the Infiniti Q50 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 100.7 (95% CI 94.4–107.1; 100 = normal for this model at that age): the 2015 build year is no different from other years of the same model at the same age.

Infiniti Q50 built in 2015 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	20.5	%	all ages tested	2019–2024	4733
Index against this model at the same age (95% CI 94.4–107.1)	100.7	index	100 = normal for this model at that age	2019–2024	4733
Rank among this model's 5 build years	2	of 5	1 = fails least for its age	2019–2024	4733
Tested in 2024	722	tests	median 78,329 miles	2024	722

Built 2015 against Infiniti Q50 normal for the age: first-time MOT failure share at each age, age 4: 18% vs 19.1%; age 5: 18.9% vs 19.5%; age 6: 20.5% vs 19.4%; age 7: 19.7% vs 19.2%; age 8: 22.6% vs 21.6%; age 9: 23.7% vs 23.8%. Axis from 0% to 30%. DVSA MOT bulk data, 2019–2024.

Check a 2015 Infiniti Q50 by registration · All Infiniti Q50 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 Infiniti Q50 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.

Infiniti Q50 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	850	18	15.6–20.7	19.1	94.2
5	783	18.9	16.3–21.8	19.5	97.1
6	804	20.5	17.9–23.5	19.4	106
7	786	19.7	17.1–22.6	19.2	103
8	788	22.6	19.8–25.6	21.6	104.7
9	722	23.7	20.7–26.9	23.8	99.4

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 4,733 (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 Infiniti Q50?

The most common failure group on cars built in 2015 is brakes: 13.2 items per 100 first tests, against 12.3 across all build years of the Infiniti Q50. These counts are not age-adjusted: cars built in 2015 were tested at ages 4 to 9.

Failure items per 100 first tests, Infiniti Q50 built 2015 against the Infiniti Q50 in all build years (2019–2024, not age-adjusted)
Failure group	Built 2015, per 100	All build years, per 100	Items
Brakes	13.2	12.3	624
Tyres	10.7	9.8	507
Lamps, reflectors and electrical equipment	6.5	4.8	308
Visibility	5.6	5.6	267
Suspension	4.9	4.3	231

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 4,733 (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 Infiniti Q50, 2015 ranks 2 (1 = fails least for its age). 2014: index 106.5. 2016: index 103.8.

Infiniti Q50 build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2014	106.5	97.9–115.0	no different (rough estimate)	2,579
2015	100.7	94.4–107.1	no different	4,733
2016	103.8	96.4–111.2	no different (rough estimate)	3,960
2017	85.0	75.6–94.3	better (rough estimate)	2,170
2018	106.7	91.7–121.7	no different (rough estimate)	1,083

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 14,525 (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). Infiniti Q50 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/infiniti-q50/2015/

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.

Other pages for this model

Infiniti Q50 2014 · Infiniti Q50 2016 · Infiniti Q50 2017 · Infiniti Q50 2018 · Infiniti Q50 by postcode area · Infiniti Q50 body, chassis and structure failures · Infiniti Q50 brakes failures · Infiniti Q50 vehicle identification failures · Infiniti Q50 lamps, reflectors and electrics failures · Infiniti Q50 noise, emissions and leaks failures · Infiniti Q50 road wheels failures · Infiniti Q50 suspension failures · Infiniti Q50 tyres failures · Infiniti Q50 visibility failures