:sam:I have a 2001 GT w/ 85k on it, I just bought it so i dont have much background besides that. About a day ago my SES light came on, so i went over to autozone and got the codes. My car was throwing out two of them, the first was a P0154: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1), and the other was a P0403: Exhaust Gas Recirculation Circuit Malfunction. Has anyone else had to deal with these two codes? what is the first thing i should check? is this why im getting bad gas millage? If you need anymore information just ask me, any help i could get with this would be awsome. I'm new to the platform so be nice, and yes i did do a search and couldnt find anything.