The Check Engine Light may illuminate due to an O2 sensor heater fault. Most commonly the affected O2 sensor will need to be replaced to correct this concern.
Problems for specific Lexus GS300 years:
Car problem reports
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Newest reported 2006 Lexus GS300 problems
A squeak type noise may be noted from one or both front seats. Squeaks can be caused by contact between the seat track locating pins and the vehicle floor pan. Our technicians tell us the repair involves removing some of the seat locating pins.
All wheel drive models may develop a creaking type noise from the front suspension when driving over uneven road surfaces. Our technicians tell us revised front sway bar bushings are available which may correct this concern.
I noticed the noise level has increased significantly while adjusting seating/driving position. Also the steering occasionally became heavy while making turns.