If you have the factory installed trailer hitch, you will find a square, plastic cover with a screw in each corner to the left of the hitch. Remove the cover (first the 4 screws, then the latch holding the cover to the socket) and you will find a European 7 pin socket. Your dealer or a VW dealer or online at a place like Suncoast or etrailer.com will sell you a Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket - Vehicle End - PK11893 which will plug into the European connector and screw right where the cover was with the same screws. This will give you a covered, standard 7 pin trailer connection. If you need to connect a 4 pin trailer connector to it, get an adapter to go from 7 to 4 pins like a 7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs. If your trailer uses LEDs it can play havoc with your Cayenne's lamp-out sensor so I recommend getting an adapter that can handle the LEDs even if your current trailer doesn't have them.