Ok here is the deal I have now replace the one at the front of the engine and now also the one right under the raditator on the pass. side of the car. Drove it for 60 miles and no light, got up to go on the trip and drove 3 miles and it came on. From reading the post so far it was raining out that day and the night that we test drove it it was nice out. The car seems to be driving ok. So this morning I had her drive the car to work to see how it drives. I think that I might just give up on the car and let it stay on. We were planing on trading it in in Dec. but I think I might push for it to be sooner. I talked to several people this weekend and they said that the code was for Bank one sensor 2. I had it scanned at Autozone and that is the what the code said. P0136 Bank1 sensor 2. Can anyone shed some light on this thing. PLEASE. . . . .