I'm getting error codes for bank 1 running rich and not enough 02 being supplied to my engine on my 2004 Cavalier. I originally though it was my MAP sensor miss reading so I replaced it and still popped out the same codes. I'm hoping it is just an O2 sensor issue but do you guys know any common causes for the combination of these 2 error codes?

 

No. MAP sensors rarely go bad, whereas O2 sensors often do, having exhaust flow over them all the time. The most common cause for a P0172 is a bad oxygen sensor.