WM 443619 REMOVING AND INSTALLING TRANSMITTER (TRIGGER) FOR Tire PRESSURE MONITORING (TPM) (ALL MODELS): Tools
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.