Test point 9: Remedy:
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
Erase fault memory, move shift lever out of reverse gear and switch off ignition. Next, switch ignition back on, move shift lever into reverse and read out fault memory.
If the fault reappears, select the menu item Modify coding and check that the vehicle type is correctly encoded.
If the coding is correct, replace the control module.