Mazda CX-30 2020: MOT failure rate for its age
7.7% of 12,487 MOT tests of the Mazda CX-30 first registered in 2020 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 97.7 (95% CI 91.5–103.9; 100 = normal for this model at that age): the 2020 build year is no different from other years of the same model at the same age.
| Measure | Value | Unit | Compared with | Years | Tests |
|---|---|---|---|---|---|
| Failed first time | 7.7 | % | all ages tested | 2019–2024 | 12487 |
| Index against this model at the same age (95% CI 91.5–103.9) | 97.7 | index | 100 = normal for this model at that age | 2019–2024 | 12487 |
| Rank among this model's 2 build years | 2 | of 2 | 1 = fails least for its age | 2019–2024 | 12487 |
| Tested in 2024 | 6198 | tests | median 25,183 miles | 2024 | 6198 |
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).
How does the 2020 Mazda CX-30 fail at each age?
Cars built in 2020 were tested at ages 3 to 4 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 | 6,289 | 6.2 | 5.6–6.8 | 6.9 | 90.4 |
| 4 | 6,198 | 9.1 | 8.4–9.9 | 8.8 | 103.5 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 12,487 (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 2020 Mazda CX-30?
The most common failure group on cars built in 2020 is visibility: 4 items per 100 first tests, against 3.6 across all build years of the Mazda CX-30. These counts are not age-adjusted: cars built in 2020 were tested at ages 3 to 4.
| Failure group | Built 2020, per 100 | All build years, per 100 | Items |
|---|---|---|---|
| Visibility | 4 | 3.6 | 504 |
| Tyres | 3.2 | 3.6 | 408 |
| Brakes | 1.5 | 1.6 | 191 |
| Noise, emissions and leaks | 0.6 | 0.5 | 82 |
| Suspension | 0.6 | 0.6 | 80 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 12,733 (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 2020 compare with the years around it?
Among the 2 published build years of the Mazda CX-30, 2020 ranks 2 (1 = fails least for its age). 2019: index 81.9.
| Build year | Index (100 = normal) | 95% interval | Verdict | Tests |
|---|---|---|---|---|
| 2019 | 81.9 | 51.6–112.3 | no different (rough estimate) | 433 |
| 2020 | 97.7 | 91.5–103.9 | no different | 12,487 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 12,920 (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-30 2020 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-30/2020/
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
Mazda CX-30 2019 · Mazda CX-30 in Norway · Mazda CX-30 in the Netherlands · Mazda CX-30 by postcode area · Mazda CX-30 brakes failures · Mazda CX-30 lamps, reflectors and electrics failures · Mazda CX-30 noise, emissions and leaks failures · Mazda CX-30 suspension failures · Mazda CX-30 tyres failures · Mazda CX-30 visibility failures