CITROËN C4 Handbook page 195

Under-inflation alert
The alert is given by the fixed
illumination of this warning lamp,
accompanied by an audible signal,
and depending on equipment, the
display of a message.
In the event of a problem on one of the tyres,
the symbol or the message appears, according
to equipment, to identify it.
F Reduce speed, avoid sudden steering
movements or harsh brake applications.
F Stop as soon as it is safe to do so.
F If you have a compressor (the one in the
temporary puncture repair kit for example),
check the four tyre pressures when cold.
If it is not possible to check the tyre
pressures at the time, drive carefully at
reduced speed.
or
F In the event of a puncture, use the
temporary puncture repair kit or the spare
wheel (according to equipment).
The alert is maintained until the tyre or
tyres concerned is reinflated, repaired
or replaced.
The spare wheel (space-saver type or a
steel rim) does not have a sensor.
The loss of pressure detected does not
always lead to visible deformation of
the tyre.
Do not rely on just a visual check.
Operating fault
The flashing and then fixed
illumination of the under-inflation
warning lamp accompanied by the
illumination of the service warning
lamp indicates a fault with the system.
This alert is also displayed when one or
more wheels is not fitted with a sensor
(for example, a space-saver or steel
spare wheel).
In this case, monitoring of the tyre pressures is
not assured.
Go to a CITROËN dealer or a qualified
workshop to have the system checked or,
following the repair of a puncture, to have the
original wheel, equipped with a sensor, refitted.
Any tyre repair or replacement on a wheel
fitted with this system must be carried out by a
CITROËN dealer or a qualified workshop.
If after changing a tyre, a wheel is not detected
by your vehicle (fitting snow tyres for example),
you must have the system reinitialised by a
CITROËN dealer or a qualified workshop.
Driving
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