WARNING: This page is about a different car, the 2018 Porsche Macan and 2017 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Fuel Injectors For Direct Fuel Injection (DFI) Components Location
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Intermediate ring/replace
Mounting/replace
Combustion chamber sealing ring/replace; do not grease