PEUGEOT 308 Handbook page 169

It compares the information given by the
wheel speed sensors with reference values,
which must be reinitialised after every tyre
pressure adjustment or wheel change.
The system triggers an alert as soon as it
detects a drop in the pressure of one or more
tyres.
The tyre under-inflation detection system
does not replace the need for vigilance on
the part of the driver.
This system still requires you to check
the tyre inflation pressures (including
the spare wheel) every month as well as
before a long journey.
Driving with under-inflated tyres impairs
handling, extends braking distances and
causes early tyre wear, particularly in
adverse conditions (heavy loads, high
speeds, long journeys).
Driving with under-inflated tyres
increases fuel consumption.
The tyre pressure specifications for your
vehicle can be found on the tyre pressure
label.
For more information on the
Identification markings, refer to the
corresponding section.
Tyre pressures should be checked when
the tyres are "cold" (vehicle stopped for
1 hour or after a journey of less than
6 miles (10 km) at moderate speeds).
Otherwise (when hot), add 0.3 bar to the
pressures shown on the label.
Snow chains
The system does not have to be
reinitialised after fitting or removing snow
chains.
Under-inflation alert
This warning is indicated by fixed
illumination of this warning lamp, an
audible signal and, depending on
the equipment installed, a message
displayed on the screen.
F Reduce speed immediately, avoid excessive
steering movements and sudden braking.
F Stop the vehicle as soon as it is safe to do
so.
The loss of pressure detected does not
always cause visible bulging of the tyre.
Do not satisfy yourself with just a visual
check.
F In the event of a puncture, use the
temporary puncture repair kit or the spare
wheel (depending on equipment),
or
F if you have a compressor, such as the one
in the temporary puncture repair kit, check
the pressures of the four tyres when cold,
or
F if it is not possible to carry out this check
immediately, drive carefully at reduced
speed.
The alert is kept active until the system is
reinitialised.
Reinitialisation
The system must be reinitialised after any
adjustment to the pressure of one or more
tyres, and after changing one or more wheels.
Driving
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