Porsche 911 Carrera Owner's Manual page 133

Select the appropriate tire size (18 or 19 inch)
and push operating lever forwards. A display
for confirming the selected tire size appears.
Note
This menu is only displayed when different tire
sizes are approved.
Select "Continue" and push the operating lever
forward.
Setting of the tire characteristics has only been
successfully completed when the message
"Process complete" is displayed by the on-board
computer.
Select arrow (Back) and push the operating
lever forward. The display returns to the
Tire pressure menu. The on-board computer
additionally displays the message "System
learning".
Note
The message "Process aborted" appears if the
setting process is interrupted. All entries made
up to this point are lost, and the original settings
remain in effect. Only if the message "Process
Controls, Instruments
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