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Will the SES light always come on when a code is set, or is it possible to set a code and the SES light never come on. Example: I unplugged my EGR valve a week ago, but the SES light never came on. Is it still possible I have a code set??
 

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Yes. If you don't have california emissions it will set a code but not the light.
 

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Often reffered to as soft codes and hard codes. Soft codes are codes that do not set the SES light, hard codes do set the SES light. It all depends on your emissions code, year, make, and model. With EFI Live, you can set which codes set what type of code (hard or soft) on the dmax.
 
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