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not to highjack post but does autozone and/or advance also have a diagnostic tool to hook up and tell exactly why engine light is on??.. the paper clip is good but gives like 5 possible problems.


I don't think anything like that exists, you are given a list of possible causes of the trouble code, sort of in descending order of likelyness. The idea is to walk down the list of items, check each componment and the determine if it is bad or not, and if not, proceed to the next item and repeat.