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I would start with a Porsche specific scan tool and see if the DME is actually seeing a signal from the sensor in question. If it is, check the cam deviation values vs spec, and check the cam positions with and without the Vario Cam activated for the expected values.
If the DME is not seeing the cam position values, I would back probe the harness connector for the sensor checking for the signal, if it is there, start tracing the harness from the sensor to the DME.
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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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