Common Problems with the
2012–2018 Lexus GS (Mk4)

We've identified 2 known issues that can affect the 2012–2018 Lexus GS (Mk4). None are considered critical, but they're worth knowing about before you buy.

Known Issues

Serious

Moderate

Minor

The 2012–2018 period has 1 more issue than the Lexus GS (Mk4) average across all year periods.

All Known Issues

Clogged Hybrid Battery Cooling Filter

ModerateEngine

Dust buildup on the hybrid battery intake filter causes the battery to overheat, shortening its life and triggering warning lights.

Estimated cost: £50 (Cleaning) / £2,000 (Battery if failed)Affects: 2012–2020Often appears around: 50,000+ miles

Typical symptoms

•"Hybrid System Fault" warning
•Fan noise from the rear seat area
•Reduced fuel economy

What to inspect before you buy

✓Inspect the filter located near the rear passenger seat base
✓Listen for a loud fan when driving

Seizing Rear Brake Calipers

ModerateBrakes

The rear calipers are known to seize in the UK climate, leading to uneven wear and MOT failure.

Estimated cost: £300–£600Affects: 2012–2018Often appears around: 60,000+ miles

Typical symptoms

•One wheel feeling much hotter than others
•Reduced fuel economy
•Car pulling to one side under braking

What to inspect before you buy

✓Check the rear discs for even wear
✓Feel for excess heat after a test drive

Buying Tips for the 2012 Lexus GS (Mk4)

✓Verify that the hybrid battery cooling fan filter (behind the rear seats) has been cleaned regularly.
✓Test the Remote Touch controller; early versions can be jerky or unresponsive.
✓Check for "binding" rear brakes, as the calipers can seize if not serviced.

2019–2020 Lexus GS (Mk4)