I just recently got my CEL went to O reillys to get it checked and it was P0018 code Bank 2. The car is running fine no power lost at all. It pulls and it idles very well. No delay. Only thing i can remember was weeks ago during thanksgiving holiday i put some chevron 93 in the car. And it kindly stalled to 500 rpms while at a light. I refilled with shell and it never happened again. That was weeks ago. Im open to any advice thx.