Page 89 of 209

Instruments and controls87If there is sufficient coolant, consult a
workshop.
The control indicator must be blue
before continuing driving.
Preheating
! illuminates yellow.
Preheating is activated. Only
activates when outside temperature
is low.
AdBlue
Y illuminates yellow.
AdBlue level is low. Refill AdBlue as
soon as possible, to avoid prevention
of engine starts.
Illuminates together with control
indicator F to indicate a system
failure or as a warning that engine
starting may not be possible after a
certain distance. Seek the assistance
of a workshop immediately.
A corresponding message appears in the Driver Information Centre (DIC)
3 89.Adblue percentage remaining can
also be checked by pressing button
repeatedly on end of wiper lever. Trip computer 3 91.
AdBlue 3 121.
Tyre pressure monitoring system
w illuminates or flashes.
Illuminates
Tyre pressure loss. Stop immediately
and check tyre pressure.
Flashes
Fault in system or tyre without
pressure sensor mounted (e.g. spare wheel). After a delay the control
indicator illuminates continuously.
Consult a workshop.
Tyre pressure monitoring system (TPMS) 3 164.
Engine oil pressure
I illuminates red.Illuminates briefly when the ignition is
switched on.
Illuminates when the engine is
running
If control indicator I illuminates
when the engine is running (together
with control indicator C and a
warning chime): Stop, switch off
engine.Caution
Engine lubrication may be
interrupted. This may result in
damage to the engine and/or
locking of the drive wheels.
1. Depress clutch.
2. Select neutral gear (or move selector lever to N).
3. Move out of the flow of traffic as quickly as possible without
impeding other vehicles.
4. Switch off ignition.
Page 166 of 209

164Vehicle careThe tyre pressure information labelon the driver's door frame indicates
the original equipment tyres and the
correspondent tyre pressures.
Always inflate tyres to the pressures
shown on the label.
Tyre pressures 3 196.
The tyre pressure data refers to cold tyres. It applies to summer and winter tyres.
Always inflate the spare tyre to the
pressure specified for full load.
Incorrect tyre pressures will impair
safety, vehicle handling, comfort and
fuel economy and will increase tyre
wear.
Tyre pressures differ depending on
various options. For the correct tyre
pressure value, follow the procedure
below:
1. Identify the engine identifier code.
Engine data 3 186.
2. Identify the respective tyre.
The tyre pressure tables show all possible tyre combinations 3 196.For the tyres approved for your
vehicle, refer to the EEC Certificate of
Conformity provided with your vehicle
or other national registration
documents.
The driver is responsible for correct
adjustment of tyre pressure.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.
Tyre pressure monitoring
system
The Tyre Pressure Monitoring
System (TPMS) uses radio and
sensor technology to check tyre
pressure levels.
Caution
Tyre pressure monitoring system
warns only about low tyre pressure condition and does not replace
regular tyre maintenance by the
driver.
All wheels must be equipped with pressure sensors and the tyres must
have the prescribed pressure.
Notice
In countries where the tyre pressure
monitoring system is legally
required, the use of wheels without
pressure sensors will invalidate the
vehicle type approval.
The TPMS sensors monitor the air
pressure in the tyres and transmit tyre pressure readings to a receiver
located in the vehicle.
Tyre pressure chart 3 196.
Tyre pressures in display
The current tyre pressures can be
shown in the Driver Information
Centre (DIC) 3 89.
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Vehicle care165
With the vehicle stationary, press
button on end of wiper lever
repeatedly until the tyre pressure
menu is displayed.
Low tyre pressure condition
A detected low tyre pressure
condition is indicated by illumination
of control indicator w 3 87 and a
corresponding message appears in
the DIC.
If w illuminates, stop as soon as
possible and inflate the tyres as
recommended 3 196.
After inflating, some driving may be
required to update the tyre pressure
values in the DIC. During this time w
may illuminate.
If w illuminates at lower temperatures
and extinguishes after some driving,
this could be an indicator for
approaching a low tyre pressure
condition. Check tyre pressure.
If the tyre pressure must be reduced
or increased, switch off ignition.
Only mount wheels with pressure
sensors, otherwise the tyre pressure
will not be displayed and w flashes for
several seconds then illuminates continuously together with control
indicator F 3 85 and a corresponding
message appears in the DIC.
A spare wheel or temporary spare
wheel is not equipped with pressure
sensors. TPMS is not operational for
these wheels. For the further three
wheels, TPMS remains operational.
Control indicator w and a
corresponding message appears at
each ignition cycle until the tyres are
inflated to the correct tyre pressure.
Driver Information Centre (DIC) 3 89.
Vehicle messages 3 90.
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166Vehicle carePuncture
A puncture or severely under-inflated
tyre is indicated by illumination of
control indicator w together with C
3 85 and a corresponding message
appears in the DIC. Stop vehicle and
switch off engine.
Tyre pressure 3 196, Tyre repair kit
3 168, Spare wheel 3 172, Wheel
changing 3 171.
Temperature dependency Tyre pressure depends on the
temperature of the tyre. During
driving, tyre temperature and
pressure increase.
Tyre pressure values provided on the tyre information label and tyre
pressure chart are valid for cold tyres,
which means at 20 °C. The pressure
increases by nearly 1.5 psi for a
10 °C temperature increase. This
must be considered when warm tyres
are checked.The tyre pressure value displayed in
the DIC shows the actual tyre
pressure. A cooled down tyre will show a decreased value, which does
not indicate an air leak.
Relearn function
After changing the wheels, TPMS
needs to recalculate.
With the vehicle stationary, select the tyre pressure menu in the DIC by
pressing button on end of wiper lever.
Press and hold button for approx.5 seconds to initialise recalculation. A
corresponding message appears in
the DIC.
Several minutes of driving at a speed above 25 mph may be required to
complete the relearn process. The
system can only provide limited
information during this time.
If problems occur during the relearn
process, control indicator w remains
illuminated and a warning message is
displayed in the DIC.
Driver Information Centre (DIC) 3 89.
Vehicle messages 3 90.
General information The use of commercially available
liquid tyre repair kits can impair the
function of the system. Factory-
approved tyre repair kits can be used.
Tyre repair kit 3 168.
External high-power radio equipment
could disrupt the tyre pressure
monitoring system.
Each time the tyres are replaced, TPMS sensors must be dismounted
and serviced by a workshop.