R
Chec kthe tyrefor foreign objects.
R Chec kwhether th ewheel is losin gair or the
valv eisl eaking.
If you are unable to rectif ythe damage, con-
tac taq ualified specialist workshop. H
Environmenta
lnote
Chec kthe tyrep ressure regularly, at least
ever y14d ays.
The recommended tyr epressures for various
operatin gcondition scan be foun donthetyre
pressure table on th efuel filler flap
(Y page 109).
Operation with atrailer: thea pplicable value
for th erear axle is th emaximum value stated in
th et yrep ressure table.
The tyr epressure table may also state tyr epres-
sures for differen tload conditions. Thes eare
defined in th etable as differen tnumbers of pas-
sengers and amounts of luggage. The actual
number of seat smay differ fro mthis.
If tyr esizes are not specified ,the tyrep ressures
stated on th etyrep ressure informatio nlabel
apply for all tyres approved for this vehicle. If one or mor
etyre sizes precedes atyre pres-
sure, the following tyre pressure information is
valido nly for that tyre size.
Use asuitable pressure gauge to check the tyre
pressure. The outer appearance of atyre does
not give any reliable indicatio nofthe tyre pres-
sure.
You can also check the tyre pressure using the
on-board computer.
If possible, correct tyre pressures only when the
tyres are cold. The tyres are cold:
R if the vehicl ehas been parked with the tyres
out of direct sunlight for at least three hours
and
R if the vehicle has not been driven further than
1.6 km
Dependin gonthe outside temperature, the
vehicle speed and the load on the tyres, the tyre temperature and thus the tyre pressure changes by approximately 10 kPa (0.1 bar/1.5 psi )per
10 †. Take this into account when checking the
pressure of warm tyres. Correct the tyre pres-
sure only if it is too low for the current operating
condition.
Drivin gwithatyre pressure that is too high or
too low can:
R shorten the service life of the tyres
R cause increased tyre damage
R have anegative effect on handling character-
istics and thus driving safety (e.g. aquaplan-
ing)
The tyre pressure values given for low loads are minimum values that offer you good driving
comfor tcharacteristics.
However, you can also use the values given for
higher loads. These are permissible and will not
adversely affect the runnin gofthe vehicle. Tyre pressur
emonitor
General notes If
at yre pressure monitor is fitted, the vehicle's
wheelsh ave sensors fitted that monitor the tyre
pressures in all four tyres. The tyre pressure
monitor warns you if the pressure drops in one
or more of the tyres. The tyre pressure monitor
functions only if the corresponding sensors are
fitted to all wheels.
Information on tyre pressures is shown on the
multifunction display. After afew minutes of
driving, the current tyre pressure of each wheel
is shown in the Serv.
Serv. menu. Tyrep
ressure
239Wheels and tyres Z
For further information on displaying this mes-
sage, refe rtothe "Checking the tyre pressure
electronically" section (Y page 240).
Important safety notes It is the driver's responsibility to set the tyre
pressure to the recommended cold tyre pres-
sure suitable for the operating situation
(Y page 238). Note that the correc ttyre pres-
sure for the current operating situation must
first be learnt by the tyre pressure monitor. If a
substantial loss of pressure occurs, the warning threshold for the warning message is aligned to
the learnt reference values. Restart the tyre
pressure monitor after adjusting to the cold tyre pressure (Y page 241). The current pressures
are saved as new reference values. This ensures that awarning message appears only if the tyre
pressure drops significantly.
The tyre pressure monitor does not warn you of
an incorrectly set tyre pressure. Observe the
notes on the recommended tyre pressure
(Y page 238).
The tyre pressure monitor is not abletow arn
you of asudden loss of pressure, e.g. if the tyre
is penetrated by aforeign object. In this event,
bring the vehicle to ahalt by braking carefully.
Avoid abrupt steering manoeuvres.
The tyre pressure monitor has ayellow h
warning lamp on the instrument cluster for indi-
cating apressure loss or malfunction. Depend-
ing on how the warning lamp flashe sorlights up,
at yre pressure that is too low or amalfunction in
the tyre pressure monitor is indicated:
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 flashe sfor around a
minute and then remains lit constantly, the
tyre pressure monitor is malfunctioning.
In addition to the hwarning lamp,am essage
appears in the multifunction display. Observe
the information on display messages
(Y page 150).
It may take up to ten minutes for amalfunction
of the tyre pressure monitor to be indicated .A
malfunction willbei ndicated by thehtyre
pressure warning lamp flashing for approx-
imatel yone minute and then remaining lit. When
the faulth as been rectified, the htyre pres-
sure warning lamp goes out after driving for a
few minutes. The tyre pressure values indicated by the on-
board computer may differ from those meas-
ured at
afilling station using apressure 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 apressure gauge are higher than those
shown by the on-board computer. In this case,
do not reduce the tyre pressures.
The operation of the tyre pressure monitor can
be affected by interferenc efrom radio transmit-
ting equipment (e.g. cordless headphones, two- way radios) that may be being operated in or
near the vehicle.
Checking the tyrep ressureelectroni-
cally X
Make sure that the key is in position 2in the
ignition lock.
X Press the =or; button on the steering
wheel to select the Serv.
Serv. menu.
X Press the 9or: button to select
Tyre pressure
Tyre pressure.
X Press the abutton.
The multifunction display shows the current
tyre pressure of each wheel.
If the vehicle has been parked for over
20 minutes, the Tyre pressures will be Tyre pressures will be
displayed
displayed after a
after afew
fewminutes
minutes of
ofdriv‐
driv‐
ing
ing message appears.
After ateach-in period, the tyre pressure moni-
tor automaticallyd etects new wheels or new
sensors. As long as aclear allocation of the tyre
pressure valuestot he individual wheels is not
possible,t heTyre
Tyre pressure
pressure monitor
monitoractive
active
displaym essage is shown instead of the tyre
pressure display. The tyre pressures are already being monitored.
If as pare wheel is fitted, the system may con-
tinue to show the tyre pressure of the wheel that has been removed for afew minutes. Please
note that in this case, the value displayed for the
replaced wheel does not indicate the current
tyre pressure of the spare wheel.
Warning messages of the tyre pressure monitor If the tyre pressure monitor detects
apressure
loss in one or more tyres, awarning messag eis
shown on the multifunction display. The yellow
h tyre pressure warning lamp then lights up. 240
Tyre pressureWheels and tyres
