well i was thinking if it is the O2 sensor, its not reading right, thats why i get a CEL and if i made it so its in clean air then it won't read anything anymore... just i might be running lean or rich and not knowing about it, but thats where an air/fuel ratio gauge comes in, when i get it, i'll know somewhat if i'm lean or rich. just my idea, but from what you said it won't work.... also is my ecu where i check the code? and is it under my passenger side dash? and would i have to take off the metal cover, and also would i have to get the CEL on once i do all this?