MOT statistics · 2023 tests

SEAT Mii MOT pass rate, common failures and mileage

In 2023, 84.7% of 17,777 MOT tests on the SEAT Mii ended in a pass, 8.2 points above the 76.5% average for all cars. Comparing like for like at ages 3 to 10, it passed 86.7% against 82.0%.

Pass rate

84.7%

All cars 76.5%

Tests

17,777

Initial MOTs in 2023

Ages 3 to 10

86.7%

All cars 82.0%

Mileage at 10

59k

Median; middle half 43k to 77k

Pass rate and mileage by age

Each row covers the SEAT Mii MOT tests at that age. Mileage shows the median and the middle half of odometer readings, from the 25th to the 75th percentile.

Age	Pass rate	Mileage
2245 tests	88.2%	13,000 · 7k to 19k
3952 tests	94.0%	17,000 · 11k to 25k
41,303 tests	91.5%	23,000 · 15k to 33k
51,265 tests	88.9%	29,000 · 19k to 41k
61,839 tests	87.5%	35,000 · 23k to 47k
72,369 tests	85.0%	41,000 · 29k to 53k
83,066 tests	84.2%	47,000 · 33k to 61k
93,192 tests	82.8%	53,000 · 39k to 69k
102,910 tests	78.8%	59,000 · 43k to 77k
11636 tests	76.3%	65,000 · 49k to 87k

Mii pass rateAll cars at that ageMiddle half of mileages

Most common MOT failures and advisories

How often each item came up, per 100 MOT tests on the SEAT Mii. Advisories are things the tester noted that did not fail the car, often wear that will need attention soon. Follow an item to see what it means and how serious it is.

Failures

Wiper blades

Wiper blade missing or obviously not clearing the windscreen

2.3in 100 tests

Brake performance

Significant brake effort recorded with no brake applied indicating a binding brake

2.0in 100 tests

Airbag warning light

An SRS malfunction indicator lamp (MIL) indicates a system malfunction

1.7in 100 tests

Side and tail lights

A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

1.6in 100 tests

Headlight aim

The aim of a headlamp is not within limits laid down in the requirements

1.6in 100 tests

Tyre tread

Tyre tread depth not in accordance with the requirements

1.5in 100 tests

Fuel cap/sealing device

Fuel system leaking, or missing or ineffective filler cap

1.4in 100 tests

Number plate lights

A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps

1.2in 100 tests

Advisories and minor defects

Brake discs

Brake disc or drum excessively weakened, insecure or fractured

6.2in 100 tests

Brake pads

A brake lining or pad worn below 1.5mm

4.1in 100 tests

Suspension bushes

A suspension pin, bush or joint excessively worn

3.3in 100 tests

Brake discs

Brake disc or drum significantly and obviously worn

2.6in 100 tests

Tyre tread

Tyre tread depth not in accordance with the requirements

1.6in 100 tests

Windscreen

Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view (minor defect)

1.2in 100 tests

Brake performance

Excessive fluctuation in brake effort through each wheel revolution.

1.1in 100 tests

Number plates

Number plate inscription missing or illegible

1.0in 100 tests

What to check on a used Mii

The parts that come up most often in SEAT Mii MOTs, and how to look at them on a viewing.

Brake discs and pads
Ask when the discs and pads were last replaced, and look through the wheel for a raised lip on the edge of the disc.
Suspension and steering joints
Listen for knocks over bumps and at full lock, and ask whether any suspension or steering joints have been replaced.
Wipers, washers and windscreen
Run the wipers and washers, and look for chips or cracks in the windscreen, above all in front of the driver.
Braking
On the test drive, brake firmly on a straight road: the car should stop straight without pulling, and the handbrake should hold it on a slope.
Warning lights
With the ignition on, every warning light should come on, then go out once the engine is running.

Check a specific Mii

Fleet averages only go so far. Enter the registration to see that car's own MOT history, mileage record and current condition, free.

Questions

What is the MOT pass rate of the SEAT Mii?

In 2023, 84.7% of 17,777 initial MOT tests on the SEAT Mii ended in a pass, against 76.5% for all cars and light vans. At ages 3 to 10, with the same age mix as all cars, it was 86.7% against 82.0%.

What fails most often on a SEAT Mii MOT?

The most common failures were wiper blades (2.3 in 100 tests), brake performance (2.0 in 100 tests), airbag warning light (1.7 in 100 tests).

What is a normal mileage for a 10-year-old SEAT Mii?

At 10 years old, the median SEAT Mii at its MOT had covered 59,000 miles, and the middle half had between 43,000 and 77,000 miles.

What do MOT testers most often advise on a SEAT Mii?

The most common advisories were brake discs (6.2 in 100 tests), brake pads (4.1 in 100 tests), suspension bushes (3.3 in 100 tests).

Other SEAT models

Overall MOT pass rate in 2023. Compare all SEAT models or see every make.

Ibiza72.2%Leon80.8%Ateca91.1%Arona88.2%Alhambra78.2%Mii84.7%Altea65.7%Toledo74.7%Tarraco87.4%Exeo71.4%

How these figures are made. We counted every initial MOT test (not retests) of cars and light vans in Great Britain in 2023 from the DVSA anonymised MOT dataset, 33,842,940 tests in all. Pass rate is the share of initial tests that ended in a pass, counting faults fixed during the test. Age is whole years from first registration to the test, so a car having its first MOT a few weeks early counts as 2.

Like-for-like pass rates average each model's pass rate at ages 3 to 10 with the same age mix for every model, so a model is not flattered by a young fleet or penalised by an old one. Models are grouped by the first word of the DVSA model name, and names that cover several models are left out.

Contains public sector information licensed under the Open Government Licence v3.0. RegTail's analysis of the DVSA anonymised MOT dataset, 2023 tests.