2021 · 3 years old at test · Electric mostly

2021 SEAT Mii MOT pass rate and common faults

1,136 MOT tests in 2024. 87.1% passed first time, compared with 87.6% for all cars the same age.

99About average
Passed first time87.1%
Failed or needed repairs12.9%
Typical mileage at test18,000

Most common reasons for failing

Share of all 1,136 tests where this item caused a failure.

  1. Tyres - condition: has a bulge, caused by separation or partial failure of its structure4.4%
    63 marked dangerous
  2. Linkage ball joints: ball joint excessively worn1.1%
  3. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords0.8%
  4. Shock absorbers: has a serious fluid leak0.7%
  5. Anti-roll bars - ball joint: ball joint excessively worn0.7%
  6. Tread depth below requirements of 1.6mm0.7%
    10 marked dangerous
  7. Tyres - condition: has a lump, caused by separation or partial failure of its structure0.7%
    11 marked dangerous
  8. Headlamp aim: too low0.6%
  9. Washers: not working0.5%
  10. Washers: provides insufficient washer liquid0.4%

Problem areas

Failure items found per 100 tests, by part of the car.

  1. Tyres7.8%
  2. Suspension3.5%
  3. Lights & electrics2.6%
  4. Visibility (wipers, screen, mirrors)1.9%
  5. Brakes0.7%
  6. Seat belts & airbags0.3%
  7. Steering0.1%
  8. Number plates & VIN0.1%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Tread depth below requirements of 1.6mm9.1%
  2. Tyres - condition: has a tear, caused by separation or partial failure of its structure5.1%
  3. Brake discs: in such a condition that it is seriously weakened2.7%
  4. Non-component advisories: Nail in tyre2.2%
  5. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.5%

What this means if you are buying one

This model year is about as good as an average car its age. Before buying, check the area that fails most: tyres - condition: has a bulge, caused by separation or partial failure of its structure. Then look up the car's own MOT history on GOV.UK with its number plate, and look for repeat advisories.

← 2020 MiiAll Mii years

Questions

What is the MOT pass rate for a 2021 SEAT Mii?

In 2024, 87.1% of 2021 SEAT Mii cars passed their MOT first time, across 1,136 tests. The average for all 3-year-old cars was 87.6%.

What are the most common MOT failures on a 2021 SEAT Mii?

The most common failure reasons were tyres - condition: has a bulge, caused by separation or partial failure of its structure; linkage ball joints: ball joint excessively worn; tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords. The biggest problem area was tyres.

Is the 2021 SEAT Mii reliable at MOT time?

Its MOT Rank score is 99, which is about average for a car of its age (100 means exactly average).