SEAT Mii MOT pass rate: 80.9% (17,185 tests, 2025)

The SEAT Mii passed 80.9% of its 17,185 MOT tests in 2025 — 3.4 points above the UK average of 77.5%. The median tested example was 10 years old with 53,190 miles on the clock.

80.9%Pass rate (2025)

17,185MOT tests analysed

53,190 miMedian mileage at test

10 yrsMedian age at test

How the Mii compares

SEAT Mii

80.9%

UK average (all Class 4 vehicles)

77.5% across 33.1 million tests

SEAT average (all models)

78.4%

What fails most on the SEAT Mii

Across failed and rectified tests in 2025, these vehicle systems produced the most defects on the Mii:

#	System	Defects recorded	Share
1	Brakes	1,797	24.8%
2	Lamps, reflectors and electrical equipment	1,239	17.1%
3	Suspension	1,056	14.6%
4	Noise, emissions and leaks	1,037	14.3%
5	Tyres	938	12.9%
6	Body, chassis, structure	467	6.4%

Pre-MOT checklist for Mii owners

Based on the failure profile above, ten minutes with a torch before your test removes the most likely fail items:

Feel for a spongy pedal or pulling to one side; check pad wear through the wheel spokes if visible
Walk round with all lights on: one blown bulb is the most avoidable fail there is
Bounce each corner and listen for clonks over speed bumps — suspension is this model’s (and the UK’s) top failure system
A blowing exhaust or visible smoke will fail; warm the engine fully before the test
Check tread with the 20p test and inspect sidewalls for cracking — tyres close to the limit are the country’s most common advisory

Check the engine before the tester does

A stored fault code with the engine light on is an automatic Major defect. Scan and clear resolved faults before booking.

Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
Autel UK testersAutel professional-grade diagnostic testers

Mii pass rate by registration year

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	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

Check a specific Mii before you buy

Pass rates describe the model; they can’t tell you about the one car you’re looking at. Run its plate through our free MOT history check to see its personal record of failures, advisories and mileage readings.

Other SEAT models

Ibiza71.6% pass rate · 186,442 tests Leon78.7% pass rate · 160,327 tests Arona85.0% pass rate · 41,799 tests Ateca89.4% pass rate · 38,935 tests Alhambra78.6% pass rate · 25,888 tests Altea66.3% pass rate · 11,126 tests Tarraco85.9% pass rate · 6,852 tests Leon Fr TSI Evo90.3% pass rate · 6,005 tests

FAQs

What is the MOT pass rate for a SEAT Mii?

In 2025, 80.9% of 17,185 first MOT tests on the SEAT Mii were passes (UK average: 77.5%). Data: DVSA anonymised MOT results.

What does the Mii fail its MOT on most?

The biggest defect group is brakes (24.8% of its recorded defects), followed by lamps, reflectors and electrical equipment.

Is the SEAT Mii reliable?

MOT pass rate is one lens on durability: at 80.9% it performs above the national average at a median age of 10 years and 53,190 miles. Always check the individual car's history too.

Source: DVSA Anonymised MOT tests and results, 2025 extract (Class 4 initial tests only; retests excluded). Contains public sector information licensed under the Open Government Licence v3.0. Figures rounded to one decimal place.