So if they were able to read them with their nifty little code reader then this reader should also be able to delete or erase the codes? Is that correct? What if I change the parts out and let the codes remain will the light go out on it's own assuming that I corrected the problem? From everything I have read so far here and elsewhere what I am getting is that it takes some time to actually have the computer remove the codes. Is that true or will it remove the CEL and codes on it's own fairly quickly? Once again assuming everything is corrected.