SEAT Mii: reliability by registration year
2012-2021 · 9 registration years · 17,800 first tests
Registration years
First-attempt MOT results for every Mii registration year with at least 500 first tests in 2025. Pass rates rise with newer cars, so read a year against its neighbours rather than against the top of the table. Years without their own report are listed here with the same figures.
| Year | First tests | First-attempt pass | Incl. PRS | Most common failure |
|---|---|---|---|---|
| 2021 | 1,055 | 87.0% | 90.1% | |
| 2019 | 1,269 | 84.0% | 88.6% | |
| 2018 | 1,235 | 82.8% | 87.6% | |
| 2017 | 1,436 | 80.2% | 84.1% | |
| 2016 | 2,154 | 74.0% | 79.6% | Petrol emissions (with catalyst) 14.5% |
| about 3 in every 100 worse than the years either side. What most often failed a 2016 Mii: Petrol emissions (with catalyst) (14.5%) · Individual sidelight or tail light (front) (14.1%) · Fuel cap (11.6%) | ||||
| 2015 | 2,607 | 73.8% | 80.2% | Individual sidelight or tail light (front) 14.3% |
| 2014 | 2,994 | 75.2% | 80.8% | Petrol emissions (with catalyst) 10.1% |
| about 3 in every 100 better than the years either side. What most often failed a 2014 Mii: Petrol emissions (with catalyst) (10.1%) · Brake performance (roller test, rear) (9.1%) · Number plate lights (7.9%) | ||||
| 2013 | 3,370 | 70.2% | 77.2% | Airbag warning light 12.8% |
| 2012 | 1,680 | 70.0% | 77.0% | Airbag warning light 17.1% |