Model reliability

Seat Mii reliability

The Seat Mii fails its MOT about as often as most cars 6 to 10 years old: 21.7% of 13,099 tests failed in 2023, against 24.4% on average.

Up to 5 years old

12.5% failed their MOT

About average

From 2,590 MOT tests of Seat Miis this age.

Where it does worse than other cars this age

Fails 55% more oftenWashers1.7% vs 1.1%

Fails 2× as oftenBrake performance1% vs 0.5%

Advised 51% more oftenTyre condition12.7% vs 8.4%Fix about £90

6 to 10 years old

21.7% failed their MOT

About average

From 13,099 MOT tests of Seat Miis this age.

Where it does worse than other cars this age

Fails 2× as oftenBrake performance4.2% vs 1.9%

Fails 33% more oftenPosition lamps2% vs 1.5%Fix about £30

Fails 18× as oftenFuel system1.8% vs 0.1%

Fails 5× as oftenSRS malfunction indicator lamp1.5% vs 0.3%Fix about £30

Advised 38% more oftenTyre condition14.2% vs 10.3%Fix about £90

Advised 3× as oftenBrake performance5.3% vs 2%

Over 10 years old

28.3% failed their MOT

Better than most

From 1,787 MOT tests of Seat Miis this age.

Where it does worse than other cars this age

Fails 6× as oftenSRS malfunction indicator lamp5.7% vs 0.9%Fix about £30

Fails 5× as oftenFuel system1.8% vs 0.4%

Fails 3× as oftenParking brake control1% vs 0.4%

Advised 67% more oftenBrake performance7.7% vs 4.6%

Safety recalls

4 DVSA recalls for the Seat Mii

Most cover a batch of cars built in a set period, and dealers fix them free. Sweep’s check shows the recalls for a car’s age and whether the DVSA has one outstanding.

R/2018/00527 Dec 2017Built 2015–2017Towing eye may be defetcive

The welding of the towing eye in the vehicle tool kit may not be fail-proof and may detach if the vehicle is towed.

Fix: On affected vehicles replace the towing eye with an improved version.

Recalled models: Mii · 3,697 vehicles

R/2016/1805 Aug 2016Built 2015–2016Manual child lock may disengage without warning

The child lock can disengage without the driver knowing and the door can again be opened from the inside. If children leave the car unnoticed and run into the road there is a risk of accident.

Fix: Recall the vehicles that are likely to be affected and check the function of the manual child lock. If necessary the door lock/s will be replaced.

Recalled models: Mii · 1,334 vehicles

R/2015/1757 Sept 2015Built 2013Driver's airbag may not deploy correctly

The driver's air bag may not correctly deploy because of a faulty welding process on the gas generator. In an air bag deployment the effect of the faulty welding process is to limit the protection and thereby increase the risk of injury.

Fix: Recall the vehicles that are likely to be affected and replace the driver's air bag.

Recalled models: Mii · 10 vehicles

R/2013/0583 May 2013Built 2013Side airbag diagnostic function disabled

Some vehicles may be fitted with airbag control units with incorrect parameters programmed. On these vehicles the diagnostic function for the side crash sensors is deactivated resulting in potential faults not being recognised and the airbag warning not illuminating.

Fix: Recall the vehicles that are likely to be affected to re programme the airbag control unit.

Recalled models: Mii · 872 vehicles

DVSA vehicle safety recalls (Crown copyright, Open Government Licence).

Checking a Seat Mii before you buy

Look at the parts above at the viewing, and read the car’s own MOT history: advisories for the same parts suggest the problem is already starting. Sweep’s free check shows every MOT, advisory and mileage reading for a registration.

Source: DVSA anonymised MOT tests 2023 (Open Government Licence v3.0). Failure rates compare this model with all cars in the same age band. Fix prices are typical independent-garage estimates.

Seat Mii reliability

4 DVSA recalls for the Seat Mii

Checking a Seat Mii before you buy

Run this check on every listing, automatically.