MOT fail rates by first-use year

2013 SEAT Mii MOT fail rate and common faults

How SEAT Mii cars first used in 2013 did at their MOTs from 2022 to 2025, against all cars of the same age. From 14,153 DVSA MOT tests of these cars. First use is usually the date the car was first registered.

MOT data updated 28 September 2026

At 12 years, tested in 2025

MOT fail rate at age 12 (n=3,501)29.5%

All cars at 12 years (n=7,303,151)36.0%

Difference−6.5 pts

MOT tests of 2013 cars, 2022 to 202514,153

What stands out

In 2025, at 12 years old, SEAT Mii cars first used in 2013 failed 29.5% of MOTs (3,501 tests), 6.5 points below the 36.0% for all cars that age.
From 2022 to 2025, as these cars went from 9 to 12 years old, the fail rate moved from 24.3% to 29.5%.
SEAT Mii cars first used a year earlier, in 2012, failed 28.9% at the same age of 12 years (1,780 tests, in 2024).
The most common fail item that is not a wear item, for the SEAT Mii at 12 years, is airbag (SRS) warning light on, at 4.5 per 100 MOTs (all cars: 0.5).

MOT fail rate by test year

SEAT Mii cars first used in 2013: share of MOT tests that failed, by test year, against all cars of the same age. Years with fewer than 1,000 tests are not shown.
Test year	Age	MOT fail rate	Tests (n)	All cars	Difference
2022	9 years	24.3%	3,557	27.1%	−2.9 pts
2023	10 years	26.0%	3,558	30.3%	−4.3 pts
2024	11 years	27.7%	3,537	33.3%	−5.6 pts
2025	12 years	29.5%	3,501	36.0%	−6.5 pts

Most common faults at 12 years

These figures cover all SEAT Mii MOTs at 12 years: cars first used 2012 to 2013, tested 2022 to 2025 (n=5,281). The list uses every first-use year so it has enough tests. Wear items (tyres, brake pads, wipers, bulbs) say more about upkeep than about the design.

MOT fail items

Fail item	Per 100 MOTs	All cars
Airbag (SRS) warning light on	4.5	0.5
Registration plate lamp(s): inoperative in the case of a single lamp or all lamps Wear	2.9	1.7
Service brake performance: excessively binding	2.7	0.9
Coil spring broken	2.1	3.9
Tyre tread below 1.6 mm Wear	2.1	2.9
Headlamp aim: too low Wear	1.9	1.5
Wipers not clearing screen Wear	1.6	2.0
Dipped headlight not working Wear	1.5	2.1
Handbrake too weak	1.4	1.5
Washers: provides insufficient washer liquid Wear	1.4	1.8

Per 100 of the MOTs above (n=5,281). A test with two items counts once for each.

Advisories

Advisory	Per 100 MOTs	All cars
Tyre tread close to the legal limit or worn on the edge Wear	13.6	18.0
Tyre condition: slightly damaged/cracking or perishing Wear	12.7	8.9
Brake discs: worn, pitted or scored, but not seriously weakened	7.3	10.4
Suspension pin or bush worn, without excessive movement	5.8	7.3
Service brake performance: binding but not excessively	4.2	1.8
Brake pads wearing thin Wear	3.5	7.6
Non-component advisories: Play in steering rack inner joint(s)	3.2	2.0
Exhaust system: has a minor leak of exhaust gases	3.2	2.6
Rigid brake pipes: corroded, covered in grease or other material	3.0	4.5
Sub-frame: corroded but not seriously weakened	2.9	3.0

Per 100 of the MOTs above (n=5,281). A test with two items counts once for each.

Fuel type at 12 years

These figures cover all SEAT Mii MOTs at 12 years: cars first used 2012 to 2013, tested 2022 to 2025 (n=5,281). Each fuel is set against all cars of the same fuel and age. Fuels with fewer than 1,000 tests are not shown.

Fuel	Share of tests	MOT fail rate	Tests (n)	All cars, same fuel	Median mileage
Petrol	100.0%	29.3%	5,279	35.3%	66,640 miles

Fail rate by mileage at 12 years

These figures cover all SEAT Mii MOTs at 12 years: cars first used 2012 to 2013, tested 2022 to 2025 (n=5,281). At 12 years, SEAT Mii cars at 60,000 to 90,000 miles failed more often (32.1%, n=2,015) than those at 30,000 to 60,000 miles (22.9%, n=1,721). Bands with fewer than 1,000 tests are not shown.

Mileage at test	MOT fail rate	Tests (n)	All cars
30,000 to 60,000 miles	22.9%	1,721	27.7%
60,000 to 90,000 miles	32.1%	2,015	36.2%

Car tax rules for a 2013 car

Cars first registered from 1 March 2001 to 31 March 2017 are taxed by CO2 emissions band, from band A (the lowest emissions) to band M. The band is set by the CO2 figure on the V5C logbook.

These are the rules, not the amount for a specific car. Car tax check

ULEZ and clean air zones

Petrol cars first registered from 2006 usually meet Euro 4, the petrol standard for the London ULEZ, so they usually do not pay the daily charge.
The clean air zones in Birmingham and Bristol use the same Euro 4 petrol and Euro 6 diesel standards. The low emission zones in Scotland use them too, but enforce them with fines, not a daily charge.

The Euro standard of the car decides, not the year alone. ULEZ checker

Other years of the SEAT Mii

2012 SEAT Mii 2014 SEAT Mii

Other SEAT models first used in 2013

Model	Age at test	MOT fail rate	Tests (n)	All cars
SEAT Ibiza (2013)	12 years in 2025	40.8%	15,920	36.0%
SEAT Leon (2013)	12 years in 2025	28.4%	11,114	36.0%
SEAT Alhambra (2013)	12 years in 2025	32.9%	1,500	36.0%
SEAT Altea (2013)	12 years in 2025	36.5%	1,396	36.0%

More on the SEAT Mii

Read this with care. A fail rate is not a measure of build quality. How far cars are driven, how they are used and how well owners maintain them all change it, and wear items such as tyres and brake pads are common fails. Compare a model only with cars of the same age. Methodology and limits.

Found one you might buy? Vet the specific car.

These figures describe 2013 SEAT Mii cars as a group, not any one car. The VetTheCar Buying Report looks at the car you are buying: its MOT history, what similar cars did next, and what to ask the seller.

See an example Buying Report All car tools

Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT test data, class 4 normal MOT tests, 2022 to 2025. MOT data updated 28 September 2026.

Not affiliated with or endorsed by DVSA. How we calculate these figures · Data sources

Car tax and clean air zone rules are summarised from GOV.UK and Transport for London guidance. They are general rules and are not drawn from the MOT data.