2017 SEAT Mii MOT pass rate: 86.4% (4,384 tests)
Is the 2017 Mii getting worse?
Pass rate of 2017-registered cars across recent test years:
Scroll horizontally to read every trend column.
| Test year | Pass rate | Pass-rate bar |
|---|---|---|
| 2023 | 90.1% +4.3 vs same-age |
90.1% visual scale |
| 2024 | 85.0% +1.1 vs same-age |
85.0% visual scale |
| 2025 | 84.1% +1.7 vs same-age |
84.1% visual scale |
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 2017 Mii
Scroll horizontally to read every failure column.
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Brakes | 280 | 24.4% |
| 2 | Tyres | 233 | 20.3% |
| 3 | Suspension | 166 | 14.5% |
| 4 | Lamps, reflectors and electrical equipment | 164 | 14.3% |
| 5 | Visibility | 136 | 11.9% |
| 6 | Noise, emissions and leaks | 90 | 7.8% |
All Mii years compared
Scroll horizontally to compare every registration-year column.
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2012 | 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 (this page) | 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 |
- Free MOT history checkThe exact car’s failures, advisories and mileage trail — sellers can’t edit it
FAQs
Is a 2017 SEAT Mii reliable?
2017-registered examples passed 86.4% of their MOT tests (4,384 tests, 2023–2025), +2.4 points versus all UK cars registered in the same year. At roughly 9 years old with a median 36,112 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2017 Mii?
The median tested example shows 36,112 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.
Before you agree to the work
A fault or an advisory is a quote waiting to happen. These pages set out what a garage has to tell you, what a comparable written quote should include, and what you can do if the bill is not what you agreed.
- When a repair costs more than the car — what a comparable quote should include, plus any verified UK figures we have sourced.
- Estimates, quotes and extra work — what a price has to cover, and when a garage may charge more than it first said.
- What a diagnostic test costs — what the fee should include, and when it should come off the repair.
- Tools — when to buy and when to skip — how to choose a diagnostic tool, and when a garage visit is cheaper than owning one.
- Choosing a garage you can check — what to verify before you hand over the keys.
- Your rights after a car repair — what to do when the work is not right, and how to put it in writing.
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 the Open Government Licence v3.0.