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This type of intermitant fault is common place in 955 Cayenne. Most of the time its ok and sometimes the car needs to reboot, (turn it off and leave it off for 5 minutes then try again) No reliable fix

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If you replaced the head unit it sounds like it may be a failure or (bad connection) of the MOST bus. If it turns on but you don't hear sounds but see the radio frequency then it is the MOST bus. As Wvicary said, have you had any add-ons such as a Mobridge or Dension?

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