The knock sensor will throw codes, mine keeps coming up P0325. However this does not turn on the SES light. It is also a 1 trip deal which I think means that it resets after the ignition is turned off.

The pictures are from last week when I replaced my drivers side headgasket. Definitely not a fun job. Mine is not a SC and I did it on the cheap so the gaskets I used were exhaust manifold gasket, 2 headgaskets (I damaged one...aaarrrhh), 2 lower intake gaskets and an upper intake gasket. The worst part of the job is getting to the fasteners etc for the stuff at the back of the engine. When you have big hands like I do getting to some of that stuff takes a real effort and some ingenuity.