BMW I8 2018: MOT failure rate for its age
9.4% of 1,577 MOT tests of the BMW I8 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 91.3 (95% CI 76.6–105.9; 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 | 9.4 | % | all ages tested | 2019–2024 | 1577 |
| Index against this model at the same age (95% CI 76.6–105.9) | 91.3 | index | 100 = normal for this model at that age | 2019–2024 | 1577 |
| Rank among this model's 6 build years | 3 | of 6 | 1 = fails least for its age | 2019–2024 | 1577 |
| Tested in 2024 | 371 | tests | median 26,848 miles | 2024 | 371 |
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).
How does the 2018 BMW I8 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 | 427 (rough estimate) | 10.1 | 7.6–13.3 | 10.8 | 93.5 |
| 4 | 401 (rough estimate) | 8.2 | 5.9–11.3 | 8.4 | 98.5 |
| 5 | 378 (rough estimate) | 9.5 | 7–12.9 | 10.8 | 88.5 |
| 6 | 371 (rough estimate) | 10 | 7.3–13.4 | 11.6 | 85.8 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 1,577 (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 BMW I8?
The most common failure group on cars built in 2018 is tyres: 8.1 items per 100 first tests, against 7.8 across all build years of the BMW I8. 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 |
|---|---|---|---|
| Tyres | 8.1 | 7.8 | 130 |
| Visibility | 3.6 | 3.8 | 58 |
| Identification of the vehicle | 2.2 | 2.1 | 35 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 1,599 (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 6 published build years of the BMW I8, 2018 ranks 3 (1 = fails least for its age). 2017: index 89.2. 2019: index 87.8.
| Build year | Index (100 = normal) | 95% interval | Verdict | Tests |
|---|---|---|---|---|
| 2014 | 97.6 | 79.7–115.6 | no different (rough estimate) | 1,024 |
| 2015 | 103.1 | 93.5–112.7 | no different (rough estimate) | 3,977 |
| 2016 | 97.3 | 86.2–108.4 | no different (rough estimate) | 2,855 |
| 2017 | 89.2 | 73.1–105.3 | no different (rough estimate) | 1,277 |
| 2018 | 91.3 | 76.6–105.9 | no different (rough estimate) | 1,577 |
| 2019 | 87.8 | 66.6–109.0 | no different (rough estimate) | 766 |
Source: DVSA MOT bulk data · Window: 2019–2024 · n = 11,476 (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). BMW I8 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/bmw-i8/2018/
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
BMW I8 2014 · BMW I8 2015 · BMW I8 2016 · BMW I8 2017 · BMW I8 2019 · BMW I8 by postcode area · BMW I8 body, chassis and structure failures · BMW I8 brakes failures · BMW I8 vehicle identification failures · BMW I8 lamps, reflectors and electrics failures · BMW I8 noise, emissions and leaks failures · BMW I8 road wheels failures · BMW I8 suspension failures · BMW I8 tyres failures · BMW I8 visibility failures