IsItAGoodCar
Reliability Guide

Common Problems with the
2019 SEAT Mii

In a bold move, SEAT discontinued the petrol-powered Mii and relaunched it exclusively as the Mii Electric. It offered a highly affordable entry point into electric vehicle ownership with a practical real-world range.

What changed for 2019

  • •Discontinuation of all petrol engines.
  • •Relaunch as the fully electric 'Mii Electric' with a 36.8kWh battery.

Common MOT watch-outs

  • !Minor software glitches relating to charging or range estimation.
  • !Tyre wear, exacerbated by the instant torque of the electric motor.
5
Known Issues
0
Serious
4
Moderate
1
Minor

All Known Issues

Water Ingress (Rear)

ModerateBodywork & Rust

Failing seals around the rear light clusters or blocked drainage holes allow water into the boot or rear footwells.

Est. Repair Cost: £50–£150
Warning Signs:

Wet boot floor, Mist on windows, Musty smell

What to Inspect:
  • Check the spare wheel well for water
  • Inspect rear light clusters for condensation
Verified by IsItAGoodCar Research Team

Window Regulator Failure

ModerateElectrics & Electronics

The cable-type window regulators can snap, letting the glass drop inside the door. More common on the driver's side due to heavier use.

Est. Repair Cost: £80–£200
Warning Signs:

Window drops into door, Window moves unevenly or slowly, Crunching noise from door

What to Inspect:
  • Run the driver's window fully up and down
  • Listen for unusual noises from inside the door panel
Verified by IsItAGoodCar Research Team

Clutch Cable Wear

ModerateGearbox & Transmission

The mechanical clutch cable can stretch or snap on manual models, leaving the clutch pedal disconnected. A known issue on VW Up! platform cars.

Est. Repair Cost: £100–£250
Warning Signs:

Clutch pedal goes slack, Gear changes become difficult, Clutch pedal does not return

What to Inspect:
  • Check clutch pedal feel and travel
  • Listen for clicking from the pedal box area
Verified by IsItAGoodCar Research Team

Starter Motor Failure

ModerateEngine

The starter motor can fail intermittently or completely, often preceded by slow cranking or clicking noises. More common on higher-mileage cars.

Est. Repair Cost: £150–£350
Warning Signs:

Slow cranking, Clicking noise when turning key, Car fails to start intermittently

What to Inspect:
  • Try starting the car several times
  • Listen for clicking from the engine bay
  • Check battery health first
Verified by IsItAGoodCar Research Team

Front Suspension Creaking

MinorSuspension & Chassis

Anti-roll bar bushes or top mounts wear prematurely, causing noise over speed bumps.

Est. Repair Cost: £80–£200
Warning Signs:

Knocking or creaking over bumps

What to Inspect:
  • Listen carefully during the test drive over uneven surfaces
Verified by IsItAGoodCar Research Team

Buying Tips for 2019 SEAT Mii

  • ✓The Mii Electric is a superb used EV; check the charging port for damage and ensure both Type 2 and CCS rapid charging function correctly.
  • ✓Verify the 'State of Health' of the battery if possible, though degradation on these models is generally low.