Ok so 300 miles into a drive last night I tripped two codes P0503 and P1133

The 503 is what has me confused its something about VSS low signal??? What is going on there?

The 1133 I'm thinking might be because I have the ZZP midlength combo and 3inch catback its something about oxygen sensor inefficiency or something, I could always just kill it in HP tuners

Anyone have some insight here?



1989 Turbo Trans Am #82, 2007 Cobalt SS G85