I just got the head gaskets replaced on my 2004 accord V6 and 1 of the heads was bad so it got replaced and the other one was good just got a valve adjustment. They also replaced the timing belt, water pump, tensioners, thermostat and radiator. I drove the car home and after 2 days the CEL came on. I scanned the car and retrieved code po175 system to rich bank 2. The car has a rough idle at stops and is using to much fuel. Runs great while driving no lack of power. Has anyone else had this problem? Or does anyone know what could be wrong? I have been told I might have a bad O2 sensor or ect sensor. Help me please........