Joelghall

Well, so much for an easy fix... I checked for loose hose on/around the air filter basket and didn't find anything. I went ahead and replaced the gas cap and disconnected the battery for about an hour to clear the codes. I just drove the car and the CE light came right back on. Will have my mechanic read the codes again to see if I get the same codes.

Hal, Thanks for the info. I will check into those suggestions tomorrow. Did you also get a P0125? Joel

I have a 1999 RX300 with 166K miles (second owner). My CE light came on and I just took it to my local mechanic to read the codes. It came out with P0125, P1153 and P1155. I have been reading an excellent previous thread on this site and decided to post. Some of the feedback on the P0125 code implied that the problem could be related to the thermostat sticking. P1153 and P1155 seem to relate to air/fuel (A/F) sensors - although 2 diferent sensors. The car is running fine. I recently had one of the A/F sensors replaced (the one on the manifold by the Trans Fluid dipstick). I also recently had the MAF sensor replaced and I removed the MAF sensor and it was not dirty. My gut feeling is that it is likely the other A/F sensor on the back side of the engine by the firewall. But the fact that the P1153 and P1155 codes relate to different sensors has me worried. Thanks for any help....Joel