Check Engine Light help! plz
 

i was just driving and my cel just popped on. i'm running a test pipe (invidia 70mm) it has the 02 fix in it and i've ran it for a couple of weeks without the cel, but what makes me think its not that is, after my car has been sitting all night the cel comes on when i turn the key before the car is even started??? help please

pull the code @ autozone or some such place then look at this thread.
https://www.s2ki.com/forums/index.php?showtopic=378792

yep autozone is great cause its free