IsItAGoodCar
Reliability Guide

Common Problems with the
2020 Lexus IS (XE30)

The final year the IS was officially sold in the UK market before Lexus withdrew it to focus on SUV models. These late cars represent the pinnacle of the XE30's development and are exceptionally reliable.

What changed for 2020

  • •Final production year for the UK market.
  • •Availability of high-specification run-out editions.

Common MOT watch-outs

  • !General wear and tear; these models are exceptionally reliable.
  • !Minor interior trim rattles.
2
Known Issues
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Serious
0
Moderate
2
Minor

All Known Issues

Rear Brake Disc Corrosion

MinorBrakes

Regenerative braking means the rear friction brakes do relatively little work on the IS 300h, so discs can corrode badly and fail MOT inspections despite otherwise easy lives.

Est. Repair Cost: £200–£400
Warning Signs:

Grinding from the rear brakes, Pitted or rusty rear discs, MOT advisory for disc condition

What to Inspect:
  • Inspect both rear discs through the wheels
  • Check the inner disc faces as well as the outer surfaces
  • Look for recent rear-brake replacement on low-mileage cars
Verified by IsItAGoodCar Research Team

Weak 12V Battery Causing Hybrid Warnings

MinorElectrics & Electronics

A tired auxiliary battery can trigger misleading warning messages, slow startup and odd behaviour even though the main hybrid system is healthy.

Est. Repair Cost: £150–£250
Warning Signs:

Hybrid or check-system warnings, Clock or trip settings resetting, Slow or hesitant startup sequence

What to Inspect:
  • Check the battery age and replacement history
  • Start the car from cold and watch for warning messages
  • Be cautious if the car has clearly sat unused for long periods
Verified by IsItAGoodCar Research Team

Buying Tips for 2020 Lexus IS (XE30)

  • Late models hold their value exceptionally well due to their legendary reliability; verify the condition justifies the price.
  • Ensure the car has a full Lexus service history to maintain the extended hybrid battery warranty.
20192021
Check a 2020 Lexus IS (XE30) by Registration