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:
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Most reported 2004 Lexus GS300 problems
I noticed the noise level has increased significantly while adjusting seating/driving position. Also the steering occasionally became heavy while making turns.
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.