Infiniti Q50 2018: MOT failure rate for its age
17.9% of 1,083 MOT tests of the Infiniti Q50 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 106.7 (95% CI 91.7–121.7; 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. This is a rough estimate from a smaller sample.
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Failed first time | 17.9 | % | all ages tested | 2019–2024 | 1083 |
| Index against this model at the same age (95% CI 91.7–121.7) | 106.7 | index | 100 = normal for this model at that age | 2019–2024 | 1083 |
| Rank among this model's 5 build years | 5 | of 5 | 1 = fails least for its age | 2019–2024 | 1083 |
| Tested in 2024 | 272 | tests | median 53,923 miles | 2024 | 272 |
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).
How does the 2018 Infiniti Q50 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.
| Age | Tests | Failed, % | 95% interval | Normal for this model at that age, % | Index (100 = normal) |
|---|---|---|---|---|---|
| 3 | 278 (rough estimate) | 15.1 | 11.4–19.8 | 12.8 | 117.7 |
| 4 | 270 (rough estimate) | 16.3 | 12.4–21.2 | 17 | 95.9 |
| 5 | 263 (rough estimate) | 22.4 | 17.8–27.9 | 18.8 | 119.6 |
| 6 | 272 (rough estimate) | 18 | 13.9–23 | 18.7 | 96.2 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 1,083 (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 Infiniti Q50?
The most common failure group on cars built in 2018 is brakes: 13.1 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 2018 were tested at ages 3 to 6.
| Failure group | Built 2018, per 100 | All build years, per 100 | Items |
|---|---|---|---|
| Brakes | 13.1 | 12.3 | 144 |
| Tyres | 8.2 | 9.8 | 90 |
| Visibility | 5.7 | 5.6 | 63 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 1,099 (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 5 published build years of the Infiniti Q50, 2018 ranks 5 (1 = fails least for its age). 2017: index 85.0.
| 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 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/infiniti-q50/2018/
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.
Other pages for this model
Infiniti Q50 2014 · Infiniti Q50 2015 · Infiniti Q50 2016 · Infiniti Q50 2017 · 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