Porsche actually did have a printed "OBD II Diagnostics" manual for each model series (986, 996, etc.) that gave you a diagnostic decision tree for each code; but those are no longer in print. Pelican used to offer a reprint of the one for 986's thru 2004, but I do not know if they still do, you'd have to check with them......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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