I can tell you that I don't get any issues with error codes at all now BUT since changing my exhaust from 2 1/4" to 3" it has wacked out my IAC counts and now no matter HOW I try I can't get them below 70 at hot idle. The car still runs fine but it bothers me that I am not within the 4-10 spec that Fitech recommends. I guess a call to tech support is in order, I will let everyone know how it pans out.