Help! I have an 01' STS. I have had the car since new and in the last two weeks I have been getting a number of codes. Also the Service Stability System comes on whenever and I will be driving when the DIC reads Stability System Engaged and it will momentarily pull to one side or the other. Is that a Steering wheel position sensor? Here are all the current codes: C1246, PO386, PO410, PO420, PO463, PO741, P1860. What are the other codes and the remedy? Thanks!