Hi everybody, This is my first post so please let me know if Ive done anything wrong. My ody got its catalytic converter cut out in philadelphia a few months ago, sucked but dealt with it, replaced everything and the o2 sensor After that, my temp gauge stopped updating while I was driving, it...

My '07 w/ 111k miles on the odometer is doing terrible on fuel economy. I drive mostly on city roads, and I'm getting no more than 11mpg. Potential cause #1: I've had a few throws of P0420 this winter and so replacing O2 sensors is on the radar. The sensors are original---regardless of whether...