Diesel Exhaust Fluid (DEF)
The exhaust gas aftertreatment requires a
reducing agent, Diesel
Exhaust Fluid (DEF), in
order to function correctly. G
Warning
If you open the DEF reservoir cap at high
temperatures, ammonia vapors could be
released.
Ammonia vapors have
a pungent odor and are
particularly irritating for your skin, respiratory
organs and eyes. This may result in burning
eyes, nose and throat, as well as coughing and
watering eyes.
Do not inhale ammonia vapors. G
Warning
Avoid contact with DEF.
DEF is hazardous
to health. Do not allow DEF
to come into contact with your skin. Rinse
affected areas with plenty of clean water and
consult a doctor if necessary.
0040Environmental note
Dispose of DEF in an environmentally
responsible manner.
! Only use DEF in accordance with
ISO 22241 .
The exhaust gas aftertreatment
system may otherwise be damaged.
Observe the MB Specifications for Service
Products, Sheet No. 352.0.
Damage caused by the use of other
reducing agents will result in the loss of
your New Vehicle Limited Warranty
entitlements.
! If DEF comes into contact with a painted
or aluminum surface, wash the surface off
immediately with plenty of water.
! DEF is not a diesel additive and must not
be mixed with fuel in the tank. Even small
amounts of DEF can cause engine damage.
Damage resulting from adding DEF is not
covered by the New Vehicle Limited
Warranty. i
If the DEF level drops below the reserve
level, the second warning message
(Y page 116) appears and at this point, at
the latest, you
must add at least 2.0 US gal
(7.6 l) of DEF.
You will find further information on DEF in the
"Service products" section (Y page 155).
DEF filler neck in the engine
compartment X
Remove the key from the ignition lock.
X Close all
vehicle doors so that no ammonia
vapors can enter the vehicle.
i Do not inhale
any ammonia vapors which
may escape when you unscrew the tank
filler cap. Ammonia vapors have a pungent
odor. However, they are neither toxic nor
hazardous to health in this concentration. X
Turn tank filler cap 0046
counter-clockwise
and remove it.
X Only fill the tank via the filler neck until the
DEF level can be seen in the filler neck.
X Replace DEF tank filler cap 0046 on the filler
neck and turn clockwise.
You will hear a click when tank filler
cap 0046 is closed fully.
DEF filler neck on the right-hand vehicle
side X
Remove the key from the ignition lock.
X Close all vehicle doors so that no ammonia
vapors can enter the vehicle. Refueling
143
Operation Z
Do not overload the tires by exceeding the
specified load limit as indicated on the Tire
and Loading Information placard on the
driver's door B-pillar. Overloading the tires
can overheat them, possibly causing a
blowout. Overloading
the tires can also result
in handling or steering problems, or brake
failure.
Check the tire pressure at least once a month.
Only check and correct tire pressures when
the tires are cold. Checking the tire pressure manually
In order to determine and adjust the tire
pressures, proceed as follows:
X Remove the valve cap of the tire you wish
to check.
X Press the
tire pressure gauge securely onto
the valve.
X Read the tire pressure and compare it with
the recommended value on the Tire and
Loading Information placard12
or on the tire
pressure plate on the B-pillar on the driver's
side of the vehicle.
X If necessary, increase the tire pressure to
the recommended value.
X If the tire pressure is too high, release air
by pressing down
the metal pin in the valve
using 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 If a tire pressure monitor is installed, the
vehicle's wheels have sensors installed that
monitor the
tire
pressures in all four tires. 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
correct wheel electronics units are installed
in all wheels.
The tire pressure monitor has a yellow
0077
warning lamp in the instrument cluster for
indicating pressure loss/malfunctions (USA)
or pressure loss
(Canada). Depending on how
the warning lamp flashes or lights up, an
underinflated tire or a malfunction in the tire
pressure monitor is displayed:
R if the 0077 warning lamp is lit continuously,
the tire pressure on one or more tires is
significantly too low. The tire pressure
monitor is not malfunctioning.
R USA only: if the 0077 warning lamp flashes
for 60 seconds and then remains lit
constantly, the tire pressure monitor is
malfunctioning. G
Warning
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the inflation
pressure recommended by the vehicle
manufacturer on the Tire and Loading
Information placard on the driver’s door B-
pillar or the
tire inflation 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 Information placard
or the tire inflation pressure label, you should
determine the proper tire inflation 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
pressure 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 underinflated tire causes the tire
to overheat and can lead to tire failure.
12 Only for vehicles with a gross vehicle weight rating of less than 10,000 lbs(4536 kg).258
Tire pressure
Wheels and tires
