If u guys get this code it's the upper o2 sensor in the eng bay. (bank 1, sensor 1) Looking at the car from the front view, its on the p/side coming of the top exhaust pipe. Lexus wanted 200 for the sensor, i paid $98 @ sparkplugs. com. It took me 20mins, if that to change it out. I disconnected the battery while changing it out, started the car up and the light did not come back on. The dealer wanted 250 plus the $89 dia test to do this. If u get this code, this is a simple job. The sensor was at my door in 4days. Just want to keep people informed in ways to save money, cause the dealer is raping people. Just mi .02cents.

 

Thank you for valuable info... will keep it in mind for future ref.

 

did you happen to take any pics of your engine while you did this on your 300

 

Na, i can though if needed. I also have the repair manual for the 300/400. tells me everything i need to take apart. I plan on changing all of them out over the next month or two. Awaiting the torque master plugs from carson, will do those next week.