Tools and materials
WARNING: This page is about a different car, the 2016 Porsche Macan and 2015 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
see → 9X00IN ORDERING AND REPAIRING ELECTRIC PLUG CONNECTIONS
Hot-air blower with special nozzle (for shrink-fit hose)
PVC tape (commercially available)