Joe is right on. Please change your handle because it is offensive. You take your car to a mechanic that throws parts at it before he figures it is out of gas and then you replace the O2 sensor with a Ford part!!!!! I seriously doubt that the O2 sensor is operating properly for a 300E. My daughter recently had an O2 sensor replaced in her Saturn and the part is different for an automatic or standard transmission. "Cheapowner" would be a better moniker