IsItAGoodCar
Reliability Guide

Common Problems with the
2021 Lexus UX

Lexus introduced the UX 300e, the brand's first-ever fully electric vehicle. While it offered legendary Lexus refinement, its relatively small battery and CHAdeMO charging port limited its appeal for long journeys.

What changed for 2021

  • •Launch of the UX 300e, Lexus's first fully electric vehicle.
  • •Minor trim updates across the hybrid range.

Common MOT watch-outs

  • !Wear on suspension components due to the increased weight of the EV battery.
  • !Minor software glitches.
2
Known Issues
0
Serious
1
Moderate
1
Minor

All Known Issues

12V Battery Drain

ModerateElectrics & Electronics

The most common complaint on UX owner forums; the 12V battery is small and can be drained by the car's connected systems.

Est. Repair Cost: £150–£200
Warning Signs:

Weak cranking, "Check Hybrid System" warning caused by low voltage, Keyless entry not working

What to Inspect:
  • Ask if the 12V battery has been replaced with a higher-capacity aftermarket unit (e.g. Yuasa)
Verified by IsItAGoodCar Research Team

Excessive Road Noise (Run-Flats)

MinorSuspension & Chassis

Models on 18-inch wheels with run-flat tyres can suffer from significant road roar on coarse UK motorways.

Est. Repair Cost: £600 (Set of non-run-flat tyres)
Warning Signs:

Loud humming from tyres, Harsh ride over expansion joints

What to Inspect:
  • Check tyre tread and brand
  • Listen for road noise at 60mph+
Verified by IsItAGoodCar Research Team

Buying Tips for 2021 Lexus UX

  • ✓On the UX 300e, be aware that it uses the older CHAdeMO rapid charging standard, which is becoming less common on newer public chargers.
  • ✓Check the electric-only range estimation, as the UX 300e's real-world range is relatively modest.
20202022
Check a 2021 Lexus UX by Registration