I am a newbie to this form but really enjoyed reading the information on it.
I have a 1996 LS400 with 106,000 miles on it. On my trip to Florida the check engine light went on and I determined that it would be best to get it fixed prior to returning back to Michigan.
I went to autozone and they diagnosed it as bank 2 sensor 2 and suggested that I could replace it myself. I got a little nervous and figured since the car was over 1,000 miles away from home that I would have it done right at a local lexus dealer in Florida.
After being quoted 330 dollars which I though was outrageous to begin with I gave them the approval. When I picked up the car the bill was 430 dollars. Well they had the sensor as 185 dollars. I told them that I could not find a sensor on the internet that costs that much and in fact I throught that the cost of that sensor was about 30 bucks. The sensor was a standard Toyota replacment part. I looked it up and found that it cost 60 dollars. They adjusted the price down by 35 dollars with out a question. Aparently they were charging over list price for the part.
Auto zone is a valuable resource to diagnose these problems. And of course they do it for free. I suggest if you get a check engine light go to them and get the diagnose code. Then have them shut it off. See if it comes on again soon. If it does then deal with it........The same sensor was reset 6 months ago and finally failed. Unfortunately it did so when I was on vacation away from my tool box.....