Here's the deal dude, try to find an O2 sim and install it asap. I myself bought a race cat and ran into the same pblm. Got sick of seeing the CEL and purchaced/installed the O2 sim. Only to find that the CEL stayed on. It ended up that my Primary O2 fouled cuz i was running way too rich. Anways, get the sim, cuz there could be some other serious shiznit going on.