MG 3 2017: MOT failure rate for its age
20.3% of 15,039 MOT tests of the MG 3 first registered in 2017 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 97.1–104.3; 100 = normal for this model at that age): the 2017 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 | 20.3 | % | all ages tested | 2019–2024 | 15039 |
| Index against this model at the same age (95% CI 97.1–104.3) | 100.7 | index | 100 = normal for this model at that age | 2019–2024 | 15039 |
| Rank among this model's 8 build years | 4 | of 8 | 1 = fails least for its age | 2019–2024 | 15039 |
| Tested in 2024 | 2881 | tests | median 40,231 miles | 2024 | 2881 |
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).
How does the 2017 MG 3 fail at each age?
Cars built in 2017 were tested at ages 3 to 7 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 | 3,495 | 13 | 11.9–14.1 | 15.2 | 85.3 |
| 4 | 2,870 | 17.3 | 15.9–18.7 | 17.7 | 97.8 |
| 5 | 2,897 | 20.7 | 19.2–22.2 | 19.9 | 104.2 |
| 6 | 2,896 | 24.1 | 22.5–25.7 | 23.8 | 101.3 |
| 7 | 2,881 | 28.2 | 26.6–29.9 | 25.5 | 110.5 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 15,039 (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 2017 MG 3?
The most common failure group on cars built in 2017 is tyres: 8.6 items per 100 first tests, against 8.3 across all build years of the MG 3. These counts are not age-adjusted: cars built in 2017 were tested at ages 3 to 7.
| Failure group | Built 2017, per 100 | All build years, per 100 | Items |
|---|---|---|---|
| Tyres | 8.6 | 8.3 | 1,291 |
| Brakes | 8.5 | 6.6 | 1,288 |
| Visibility | 5.8 | 5.7 | 876 |
| Suspension | 3.5 | 4.9 | 532 |
| Lamps, reflectors and electrical equipment | 3.5 | 4.3 | 521 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 15,091 (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 2017 compare with the years around it?
Among the 8 published build years of the MG 3, 2017 ranks 4 (1 = fails least for its age). 2016: index 100.5. 2018: index 105.5.
| Build year | Index (100 = normal) | 95% interval | Verdict | Tests |
|---|---|---|---|---|
| 2013 | 92.8 | 81.5–104.1 | no different (rough estimate) | 979 |
| 2014 | 101.6 | 97.8–105.4 | no different | 9,938 |
| 2015 | 100.9 | 97.6–104.2 | no different | 14,519 |
| 2016 | 100.5 | 97.4–103.6 | no different | 18,604 |
| 2017 | 100.7 | 97.1–104.3 | no different | 15,039 |
| 2018 | 105.5 | 101.0–110.1 | worse | 10,261 |
| 2019 | 99.5 | 95.0–104.0 | no different | 10,954 |
| 2020 | 105.7 | 98.5–112.9 | no different | 4,946 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 85,240 (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). MG 3 2017 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/mg-3/2017/
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
MG 3 2013 · MG 3 2014 · MG 3 2015 · MG 3 2016 · MG 3 2018 · MG 3 2019 · MG 3 2020 · MG 3 by postcode area · MG 3 body, chassis and structure failures · MG 3 brakes failures · MG 3 vehicle identification failures · MG 3 lamps, reflectors and electrics failures · MG 3 noise, emissions and leaks failures · MG 3 road wheels failures · MG 3 seat belts and airbags failures · MG 3 steering failures · MG 3 suspension failures · MG 3 tyres failures · MG 3 visibility failures