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Well, it certainly pretty much eliminates anything mechanical and it must be in the DME. I don't know it well enough to guess what comes in after 30 minutes but perhaps you can do some logging to figure it out. Does the EVAP solenoid open or something like that and it tries to purge the tank pressure ??? I have no clue but logging all parameters would maybe point to something that opens or changes at that interval. There are some codes that cars won't throw till a 2nd or 3rd drive cycle or a drive cycle that is over a certain length of time, I don't know what that is on the Porsche as I am a mechanic but not Porsche specific or that familiar with it.
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