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The tyres are cold:
if the vehicle has been parked with the tyres
R
out of direct sunlight for at least three
hours and
if the vehicle has not been driven further
R
than 1.6 km
Depending on the ambient temperature, the
speed at which you are driving 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. Only correct the tyre pressure if it
is too low for the current operating condi-
tions.
Driving with tyre pressure that is too high or
too low can:
shorten the service life of the tyres
R
cause increased tyre damage
R
have a negative effect on handling charac-
R
teristics and thus driving safety (e.g. aqua-
planing)
i
The tyre pressure values given for low
loads are minimum values which offer you
good ride comfort characteristics.
However, you can also use the values given
for higher loads. These are permissible and
will not adversely affect the running of the
vehicle.
Tyre pressure loss warning system
General notes
While the vehicle is in motion, the tyre pres-
sure loss warning system monitors the set
tyre pressure using the rotational speed of
the wheels. This enables the system to detect
significant pressure loss in a tyre. If the speed
of rotation of a wheel changes as a result of a
loss of pressure, a corresponding warning
message will appear in the multifunction dis-
play.
You can recognise the tyre pressure loss
warning by the
Run Flat Indicator
Run Flat Indicator
active Restart with OK
active Restart with OK
appears in the
Serv.
Serv.
tion display. Information on the message dis-
play can be found in the "Restarting the tyre
pressure loss warning system" section
(
page 601).
Y
Important safety notes
The tyre pressure warning system does not
warn you of an incorrectly set tyre pressure.
Observe the notes on the recommended tyre
pressure (
page 600).
Y
The tyre pressure loss warning does not
replace the need to regularly check the tyre
pressures. An even loss of pressure on sev-
eral tyres at the same time cannot be detec-
ted by the tyre pressure loss warning system.
The tyre pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. if the
tyre is penetrated by a foreign object. In the
event of a sudden loss of pressure, bring the
vehicle to a halt by braking carefully. Avoid
abrupt steering manoeuvres.
The function of the tyre pressure loss warning
system is limited or delayed if:
snow chains are fitted to your vehicle's
R
tyres.
road conditions are wintry.
R
you are driving on sand or gravel.
R
you adopt a very sporty driving style (cor-
R
nering at high speeds or driving with high
rates of acceleration).
you drive with a heavy load.
R
Restarting the tyre pressure loss warn-
ing system
Restart the tyre pressure loss warning system
if you have:
changed the tyre pressure
R
changed the wheels or tyres
R
fitted new wheels or tyres
R
Before restarting, make sure that the tyre
X
pressures are set properly on all four tyres
for the respective operating conditions.
Tyre pressure
message which
menu of the multifunc-
Z
601
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