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Guys, Porsche has always used a unique diagnostic system protocol, which very few have only sporadically gotten thru. This is exactly why the almighty PIWIS system is useless on non-Porsche vehicles, just like the Durametric system. If you want to access and adequately diagnose one of these cars, you need a Porsche specific scan tool, it is the "price of admission" to working on these cars................so that means either jumping $20K for the first year for a PIWIS unit, or a couple hundred bucks for the Durametric system, there is no other way.
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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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