Porsche 911 Carrera Owner's Manual page 135

Tire pressure warnings
The Tire Pressure Monitoring warns about loss in
pressure in two stages, depending on the amount
of pressure loss:
Stage 1 - Add air (3 psi to 6 psi (0.2 bar to 0.4 bar)
loss in pressure)
Stage 2 - Flat tire (from 6 psi (0.4 bar) loss in
pressure)
Stage 1 - Add air
The pressure in the tire is too low by 3 psi to 6 psi
(0.2 bar to 0.4 bar). Driving with insufficient tire
pressure reduces the road safety of the vehicle and
destroys the tire and wheel.
The tire pressure warning contains the
affected tire with the tire pressure to be
added. Correct the tire pressure at the next
opportunity.
This tire pressure warning appears with vehicle
stopped and can be deactivated. The tire pressure
warning light in the instrument panel goes out when
the tire pressure has been corrected.
Stage 2 - Flat tire
The pressure in the tire has dropped by more than
6 psi (0.4 bar). This significant pressure loss is a
danger to road safety.
When the tire pressure warning has appeared
on the on-board computer, stop immediately at
a suitable location. Check the tire for signs of
damage. If necessary, fill in tire sealant and set
the correct tire pressure.
This tire pressure warning appears when driving
and can be deactivated. The tire pressure warning
light in the instrument panel goes out when the tire
pressure has been corrected.
System learning
The Tire Pressure Monitoring begins to "learn" the
wheels after a wheel change, wheel transmitter
replacement or update of the tire settings. During
Controls, Instruments
133