One problem related to check engine light on has been reported for the 2006 Lexus GS300. The most recently reported issues are listed below.
On February 9, 2006, the fourth occurrence occurred. Each time, there was a strong smell of sulfur in the car with the windows closed. A day or a few days later, the check engine light went on (check vsc). I am concerned that there may also be carbon monoxide in the car at the same time. The dealer/service manager indicates that there is fuel in the engine oil. I do not know if it is safe to operate a brand new vehicle with fuel in the engine oil. Attempts have been made to correct the problem, parts replaced, but the problem has recurred four times with 1494 miles on the odometer.