Sefvice Engine Soon light came on Sunday and I was finally able to get to it today. Had this mechanic I know reset the codes. Oxygen sensor and two more. I can't wait till I get my Duramax since a diesel doesn't have them stupid oxygen sensors.

The Ox sensor is rarely bad. See it frequently with EGR codes.

It's not bad, it just came on with the other two that combined together. It all happened right when I floored it from a stop sign and the truck was revving a little bit.