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Vehicle care 169
9 Warning
If the pressure is too low, this can
result in considerable tyre warm-
up and internal damage, leading to
tread separation and even to tyre
blow-out at high speeds.
If the tyre pressure must be reduced
or increased on a vehicle with tyre
pressure monitoring system, switch
off ignition.
Tyre deflation detection
system
The tyre deflation detection system
continually checks the rotation speed
of all four tyres.
If a tyre loses pressure the control
indicator w illuminates yellow and
a warning message is displayed in the
Driver Information Center with
Uplevel-Display. Stop immediately
and check tyre pressure.
Control indicator w 3 92.
System initialisation
After tyre pressure correction or
wheel change, the system must be
initiated: Switch on the ignition, press
and hold the DDS button for approx.
4 seconds.
If the system is ready again,
a message is displayed in the Driver
Information Center with
Uplevel-Display.
Tread depth
Check tread depth at regular
intervals.
Tyres should be replaced for safety
reasons at a tread depth of 2-3 mm
(4 mm for winter tyres).
The legally permissible minimum
tread depth (1.6 mm) has been
reached when the tread has worn
down as far as one of the tread wear
indicators (TWI). Their position is
indicated by markings on the
sidewall.
If there is more wear at the front than
the rear, swap round front wheels and
rear wheels periodically. Ensure that
the direction of rotation of the wheels
is the same as before.
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