2018 SEAT Mii · 4,150 MOT tests
2018 SEAT Mii reliability
2018 SEAT Miis fail 15.1% of first MOT tests, 20% more MOT fails than the average car its age and mileage, ranking 7 of 8 Mii years (4,150 DVSA tests, 2022 to 2024).
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- first-time fail rate (all SEAT Miis: 21.4%)
- 15.1%
- first-time fail rate (all SEAT Miis: 21.4%)
- fails than cars of the same age and mileage
- 20% more
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 4
- 24,720
- typical miles at its MOT, aged about 4
- MOT tests, 2022 to 2024
- 4,150
- MOT tests, 2022 to 2024
Year on year
2018 against the years either side
- 2017 cars: 15% more MOT fails than the average car its age (the 2018 car does worse)
- 2019 cars: about average for its age (the 2018 car does worse)
- Weak spot: windscreen, wipers and mirrors, 5.8% of tests fail here (86% above cars of the same age and mileage).
- Strong point: suspension, 25% fewer fails than comparable cars.
- Plates: a 2018 car carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
Common problems
What fails on a 2018 SEAT Mii
Fail rate by area
- Windscreen, wipers and mirrors5.8%
- Lights and electrics4.8%
- Tyres3.3%
- Brakes2.2%
- Suspension1%
- Exhaust, emissions and leaks0.6%
- Seat belts and airbags0.4%
Average for cars of the same age and mileage
Top failures
Wiper blade not clearing windscreen 4.34%
Wipers that do not clear the windscreen reduce visibility in rain, which is a safety risk, so replace them.
Headlamp aim set too low 1.4%
Headlamps aimed too low light the road poorly and reduce the driver's view ahead, especially at night.
Tyre tread below 1.6mm 0.99%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Daytime running lamp not working 0.87%
A failed daytime running lamp makes the car less visible to other road users, so it should be repaired.
Position lamp not working 0.87%
A failed position lamp makes the car harder to see in poor light and is illegal, so it must be repaired.
Tyre cut reaching ply or cords 0.65%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Common advisories
Tyre slightly damaged or cracking (12.75%) · Tyre worn close to legal limit (9.06%) · Brake disc pitted or scored (2.65%) · Suspension arm pin/bush showing wear (2.41%) · Brake discs showing some wear (2.41%) · Brake pads wearing thin (2.39%)
Is a 2018 SEAT Mii reliable?
2018 SEAT Miis fail 15.1% of first MOT tests, 20% more MOT fails than the average car its age and mileage, ranking 7 of 8 Mii years (4,150 DVSA tests, 2022 to 2024).
What fails on a 2018 SEAT Mii MOT?
Most often wiper blade not clearing windscreen (4.34% of tests), headlamp aim set too low (1.4% of tests), tyre tread below 1.6mm (0.99% of tests).
How many miles should a 2018 SEAT Mii have done?
At its MOT aged about 4, a typical 2018 SEAT Mii shows 24,720 miles. Much higher or lower is worth asking about.
What plate is a 2018 car?
A car first registered in 2018 carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
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