2012 SEAT Mii MOT pass rate: 77.8% (5,206 tests)
Is the 2012 Mii getting worse?
Pass rate of 2012-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2023 | 78.7% +6.4 vs same-age |
|
| 2024 | 77.3% +6.3 vs same-age |
|
| 2025 | 77.3% +7.0 vs same-age |
The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.
What fails on a 2012 Mii
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Brakes | 726 | 27.4% |
| 2 | Lamps, reflectors and electrical equipment | 431 | 16.3% |
| 3 | Tyres | 315 | 11.9% |
| 4 | Suspension | 309 | 11.7% |
| 5 | Seat belts and supplementary restraint systems | 256 | 9.7% |
| 6 | Body, chassis, structure | 207 | 7.8% |
All Mii years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2012 (this page) | 5,206 | 77.8% | +6.6 pts | 66,377 |
| 2013 | 10,381 | 79.0% | +5.7 pts | 61,678 |
| 2014 | 9,192 | 82.0% | +6.2 pts | 54,841 |
| 2015 | 7,947 | 82.4% | +3.7 pts | 48,300 |
| 2016 | 6,604 | 82.7% | +1.3 pts | 42,446 |
| 2017 | 4,384 | 86.4% | +2.4 pts | 36,112 |
| 2018 | 3,743 | 88.8% | +2.4 pts | 29,527 |
| 2019 | 3,866 | 91.5% | +3.1 pts | 23,043 |
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FAQs
Is a 2012 SEAT Mii reliable?
2012-registered examples passed 77.8% of their MOT tests (5,206 tests, 2023–2025), +6.6 points versus all UK cars registered in the same year. At roughly 14 years old with a median 66,377 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2012 Mii?
The median tested example shows 66,377 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.