I have been trying to figure out exactly what this code is for and i think i finally narrowed it down. The possible problems for this code to appear are, neutral safety switch, clutch depressed when testing, ac/defroster left on during test or bad ac system. I tihk my problem is the airconditioning system. the clutch on the compressor dosn't engage like it is supposed to(i am out of freon and i bet i have a leak like all the mustangs that i have owned did) How do i tell the computer that i don't have airconditioning so this code goes away. Will simply unplugging it work or is there something more that needs to be done.