The tyre pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. following
penetration by a foreign object. In this event,
bring the vehicle to a halt by braking carefully.
Avoid sudden steering movements.
The h warning lamp on the instrument clus-
ter shows a detected loss in pressure or a mal-
function:
R
if the h warning lamp is lit continuously,
the tyre pressure on one or more tyres is sig-
nificantly too low. The tyre pressure monitor
is not malfunctioning.
R
if the h warning lamp flashes for around a
minute and then remains lit constantly, the
tyre pressure monitor is malfunctioning.
The display also shows a message:
R
on vehicles without steering wheel buttons
(Y page 257)
R
on vehicles with steering wheel buttons
(Y page 276)
If the tyre pressure monitor is malfunctioning, it
may be more than ten minutes before the h
warning lamp displays the malfunction. When
the error has been rectified, the h warning
lamp goes out after a few minutes of driving.
The tyre pressure values indicated by the on-
board computer may differ from those meas-
ured at a filling station with a pressure gauge.
The tyre pressures shown by the on-board com-
puter refer to those measured at sea level. At
high altitudes, the tyre pressure values indica-
ted by a pressure gauge are higher than those
shown by the on-board computer. In this case,
do not reduce the tyre pressures.
If radio transmitting equipment (e.g. cordless
headphones, two-way radios) is operated inside
the vehicle or in the vicinity of the vehicle, this
can interfere with the operation of the tyre pres-
sure monitor.
Checking the tyre pressure electroni-
cally on vehicles with steering wheel
buttons
You can only check the tyre pressure electroni-
cally on vehicles with steering wheel buttons.
Use the steering wheel buttons.
X
Turn the key to position 2 in the ignition lock.
X
Press the = or ; button to select the
Service menu.
X
Use the 9 or : button to select Tyre
pressure.
X
Press a to confirm.
The current tyre pressure of each wheel is
shown in the display.
If the vehicle has been parked for longer than
20 minutes, the Tyre pressures will be
displayed after a few minutes of driv‐
ing message appears in the display.
After a teach-in period, the tyre pressure moni-
tor automatically detects new wheels or new
sensors. As long as clear allocation of the tyre
pressure values to the wheel positions is not
possible, the Tyre pressure monitor active
message is displayed instead of the tyre pres-
sure display. The tyre pressures are already
being monitored.
Warning messages of the tyre pressure
monitor
If the tyre pressure monitor detects a pressure
loss in one or more tyres, a warning message is
shown on the display. The h warning lamp
lights up.
Vehicles without steering wheel buttons
R
If the display shows the Please correct
tyre pressure message the tyre pressure in
at least one of the tyres is too low. The tyre
pressure must be corrected at the next oppor-
tunity.
R
If the display shows the Check tyres mes-
sage the tyre pressure in one or more of the
tyres has dropped sharply. The tyres must be
checked.
R
If the display shows the Caution Tyre
malf. message the tyre pressure in one or
more of the tyres has dropped suddenly. The
tyres must be checked.
Vehicles with steering wheel buttons
R
If the display shows the Please correct
tyre pressure message the tyre pressure in
at least one of the tyres is too low. The tyre
pressure must be corrected at the next oppor-
tunity.
R
If the display shows the Check tyre(s) mes-
sage the tyre pressure in one or more of the
tyres has dropped sharply. The tyres must be
checked.
R
If the display shows the Warning tyre
defect message the tyre pressure in one or
362
Tyre pressure
Wheels and tyres
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