Is the reader communicating with the car?
If it is communicating, but not displaying codes, you'll need a Porsche specific scanner.
If it is not communicating at all, it could be a connector issue, but this is unlikely. Also, make sure that the plug is fully seated as the socket on the car is configured to fit both Porsche specific scan tools and OBDII...OBDII scanners can be a little tricky to get in the socket correctly.
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