I was wondering what the best way to get the diagnostic codes are? Is there some way I can do this myself, or do I have to take it to the dealer and let them charge me $40 to tell me the codes/problem?

I just installed the Calmini Hi-Flo air filter, and 2 days later, the light comes on... cooincidental? I dunno, but I don't want to spend $40 for them to tell me it's an air intake problem.

Should I have reset the computer before putting the new filter on? What could be causing it?