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I was stymied by the same problem with my 2004 Cayenne Turbo. Couldn't figure out where in the PCM I could set the date. The year on mine was showing 1998 for a while, and then one day it was displaying 2006. The local Porsche dealer was no help.... I had another problem that resulted in the car being in the shop with the battery disconnected. When I picked up the car, the time and date were correct. The only thing I can determine is that disconnecting the battery for a period of time, and then reconnecting it allowed the system to reset, and when the PCM reconnected with the satellites, it set the day, date, and time to the current, correct time.......you might try that..............
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