i
If you switch off the engine at a low out-
side temperature and add DEF, restart the
engine after refueling. If you leave the vehi-
cle parked without restarting the engine
and the DEF freezes in the DEF tank, the
on-board computer will only be able to reg-
ister the new fill level after a defrosting
period of up to 60 minutes. During this time
the engine may only be operated in neutral.
You will find further information on DEF in the
"Service products" section (Y page 321).
Refueling procedure DEF filler neck in the engine compartment
X
Remove the key from the ignition lock.
X Switch off the auxiliary heating system
(Y page 130).
X Open the hood.
X Close all vehicle doors so that no ammonia
vapors can enter the vehicle.
i Do not inhale any ammonia vapor which
may escape when you unscrew cap 0043.
Ammonia vapors have a pungent odor.
However, they are neither toxic nor hazard-
ous to health in this concentration.
X Turn blue cap 0043counter-clockwise and
remove it.
X Only fill up the DEF tank until the DEF level
is visible in the filler neck.
X Replace blue DEF filler neck cap 0043on the
filler neck and turn clockwise.
You will hear a click when cap 0043is fully
closed. DEF filler neck on the right-hand vehicle
side The DEF reservoir on the right-hand side of the
vehicle (example: Cab Chassis)
Fuel filler cap
X
Remove the key from the ignition lock.
X Switch off the auxiliary heating system
(Y page 130).
X Remove tool 0083for unlocking tank filler
cap 0044from the footwell on the co-driver's
side (Y page 276).
X Close all vehicle doors so that no ammonia
vapors can enter the vehicle.
X Pull cover 0085up, turn 90° and release.
X Insert tool 0083into hole 0087of tank filler
cap 0044.
i Do not inhale any ammonia vapor that
may escape when you unscrew tank filler
cap 0044. Ammonia vapors have a pungent
odor. However, they are neither toxic nor
hazardous to health in this concentration.
X Turn blue filler cap 0044counter-clockwise,
remove it and let it hang from strap 0043.150
RefuelingDriving and parking
information table or the tire pressure table
(Y
page 290).
X If the tire pressure is too low, increase it to
the recommended value.
X If the tire pressure is too high, release air
by pressing down the metal pin in the valve.
Use the tip of a pen, for example. Then,
check the tire pressure again using the tire
pressure gauge.
X Screw the valve cap onto the valve.
X Repeat the steps for the other tires. Tire pressure monitor
Important safety notes G
WARNING
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the pressure rec-
ommended by the vehicle manufacturer on
the Tire and Loading Information placard on
the driver's door B-pillar or the tire pressure
label on the inside of the fuel filler flap. If your
vehicle has tires of a different size than the
size indicated on the Tire and Loading Infor-
mation placard or the tire pressure label, you
should determine the proper tire pressure for
those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pres-
sure telltale when one or more of your tires
are significantly underinflated. Accordingly,
when the low tire pressure telltale illuminates,
you should stop and check your tires as soon
as possible, and inflate them to the proper
pressure. Driving on a significantly underin-
flated tire causes the tire to overheat and can
lead to tire failure. Underinflation also
reduces fuel efficiency and tire tread life, and
may affect the vehicle's handling and stop-
ping ability.
Please note that the TPMS is not a substitute
for proper tire maintenance, and it is the driv-
er's responsibility to maintain correct tire pressure, even if underinflation has not
reached the level to trigger illumination of the
TPMS low tire pressure telltale.
USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate if the
system is not operating properly. The TPMS
malfunction indicator is combined with the
low tire pressure telltale. When the system
detects a malfunction, the warning lamp will
flash for approximately a minute and then
remain continuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists.
When the malfunction indicator is illuminated,
the system may not be able to detect or signal
low tire pressure as intended. TPMS malfunc-
tions may occur for a variety of reasons,
including the mounting of incompatible
replacement or alternate tires or wheels on
the vehicle that prevent the TPMS from func-
tioning properly. Always check the TPMS mal-
function telltale after replacing one or more
tires or wheels on your vehicle to ensure that
the replacement or alternate tires and wheels
allow the TPMS to continue to function prop-
erly.
Vehicles with a tire pressure monitor are
equipped with sensors in the wheels that
monitor the tire pressure of all four tires. The
tire pressure monitor monitors the pressure
in all four tires; you set this pressure when
you activate the tire pressure monitor. The
tire pressure monitor warns you when the
pressure drops in one or more of the tires. The
tire pressure monitor only functions if the
corresponding sensors are installed to all
wheels.
You should always adjust the tire pressure
according to the vehicle load. Restart the tire
pressure monitor if you change the tire pres-
sure.
The tire pressure monitor does not warn you
if a tire pressure is incorrect. Observe the Tire pressure
293Wheels and tires Z
