Checking the tire pressure electroni-
cally (vehicles with steering wheel but-
tons)
Tire pressuredisplay
Using the steering wheel buttons
XTurn the key to position 2in the ignition lock.
XPress the VorU button repeatedly
until the standard display is shown
(
Ypage 166).
XPress the 9or: button repeatedly
until the current pressure of the individual
tires is shown in the display.
If the vehicle is parked for longer than
20 minutes or you then drive at less than 18 mph
(30 km/h), the Tire pres. displayed
after driving for several minutesmes-
sage appears.
iThe tire pressure value shown in the display
may differ from those measured at a gas sta-
tion using a pressure gauge. The on-board
computer will generally give you a more exact
value.
Tire pressure loss warning system
Vehicles with steering wheel buttons
If the tire pressure monitor detects a pressure
loss in one or more tires, the on-board computer
displays the yellow Tire
pres.Adjustpres.warning message. The htire pressure loss
warning lamp in the instrument cluster
(
Ypage 202) flashes for about 60 seconds and
then remains lit.
The tire pressure of the affected wheel is high-
lighted in yellow in the on-board computer.
If the tire pressure monitor detects a significant
pressure loss in one or more tires, the on-board
computer displays the red Tire pres.
Warn‐ingTiredefectwarning message. Theh
tire pressure loss warning lamp in the instru-
ment cluster (
Ypage 202) flashes for about 60
seconds and then remains lit. An additional
warning tone sounds. The tire pressure of the affected wheel is high-
lighted in yellow in the on-board computer.
Restarting the tire pressure monitor
When you restart the tire pressure monitor, the
currently set tire pressures are taken as refer-
ence values for monitoring.
In most cases, the tire pressure monitor detects
the new reference values automatically, e.g.
after you have:
Rchanged the tire pressure
Rchanged wheels or tires
Rinstalled new wheels or tires
However, you can also define reference values
manually as described here.
Before restarting the tire pressure monitor:
XSet the tire pressure to the value recommen- ded on the Tire and Loading Information plac-
ard or the tire pressure table on the B-pillar on
the driver's side (
Ypage 251).
Observe the notes on tire pressure when
doing so (
Ypage 251).
XMake sure that the tire pressure is correct on
all four wheels.
Restarting the tire pressure monitor (vehi-
cles without steering wheel buttons):
XTurn the key to position 2in the ignition lock.
XPress the 4menu button on the instrument
cluster repeatedly until the display shows the
following message:
+CAL- TPMS
XPress the fbutton on the instrument clus-
ter.
The display shows:
OK TPMS
The tire pressure monitor activation process
has begun. The tire pressure measured for the individual wheels are stored as the new ref-
erence values, provided that the tire pressure
monitor considers them to be plausible.
If you wish to cancel the restart:
XPress the gbutton or the 4menu button on
the instrument cluster.
The activation process is canceled automati-
cally if 30 seconds elapse without input.
256Tire pressure
Wheels and tires
Restarting the tire pressure monitor (vehi-
cles with steering wheel buttons):
XTurn the key to position2in the ignition lock.
XPress the VorU button on the steering
wheel until the standard display (Ypage 166)
appears in the display.
XPress the 9or: button on the steering
wheel repeatedly until the current pressure of
the individual tires is displayed or the display
shows the following message:
Tire pres. displayed after driving
for several minutes
XPress the 9reset button on the instrument
cluster.
The display shows the following message: Monitor current tire pressure?
XPress the
Wbutton on the steering wheel.
The display shows the following message:
Tire pres. monitor reactivated
The tire pressure monitor activation process
has begun. The tire pressure measured for the individual wheels are stored as the new ref-
erence values, provided that the tire pressure
monitor considers them to be plausible.
If you wish to cancel the restart:
XPress the Xbutton on the steering wheel.
Tire pressure table
Front axle tire pressure values: the following tire pressure values only apply to vehicles with a
permissible front axle load of 3970 lb s(1801 kg), 4080 lbs (1851 kg), 4100 lbs (1860 kg) or 4410 lbs
(2000 kg).
Tires/disc wheelFront axle load
3970 lbs
(1801 kg) 4100 lbs
(1860 kg)4080 lbs
(1851 kg)4410 lbs
(2000 kg)
205/75 R 16 C 110/108R
6.5J x 16 ET 626—400 kPa
(4.0 bar/58 psi)420 kPa
(4.2 bar/61 psi)
LT 215/85 R 16 115/112N
5.5Jx16
Half distance between centers: 4.94 in
(125.5 mm)—380 kPa
(3.8 bar/55 psi)420 kPa
(4.2 bar/61 psi)
LT 215/85 R 16 115/112Q
5.5Jx16
Half distance between centers: 4.94 in
(125.5 mm)—380 kPa
(3.8 bar/55 psi)420 kPa
(4.2 bar/61 psi)
LT 245/75 R 16 120/116N
6.5J x 16
Wheel offset: 2.13 in (54 mm)340 kPa
(3.4 bar/49 psi)——
6Vehicles with Super Single tires.
Tire pressure257
Wheels and tires
Z
wheel buttons to call up theTrip computer
menu (Ypage 173).
Diesel Exhaust Fluid (DEF)
General notes
When opening the DEF tank filler cap at high
outside temperatures, ammonia vapors may
escape.
Ammonia vapors have a pungent smell and pri-
marily cause irritation of the:
Rskin
Rmucous membranes
Reyes
You may experience a burning sensation in your
eyes, nose and throat, as well as coughing and
watering of the eyes.
Do not inhale ammonia vapors. Avoid contact
with DEF.
Do not allow DEF to come into direct contact
with your skin; it is hazardous to your health.
Rinse any affected areas off with plenty of clean water. Consult a doctor if necessary.
If DEF heats up, e.g. in direct sunlight, in the DEF
supply reservoir for some time to over 122 ‡
(50 †) , ammonia vapor will develop.
To conform to emission regulations, you must
operate the vehicle with DEF and refill the supply
regularly. The engine management recognizes
attempts to operate the vehicle without DEF,
with thinned DEF or with another reducing
agent. After previous warning messages, the
engine management then prevents a further
engine start.
When the number of remaining engine starts is 0
the engine management prevents the vehicle
from being driven at a speed exceeding 5 mph
(8 km/h). The multifunction display shows the
Idle Mode
message.
DEF consumption
DEF consumption depends on operational and
driving conditions and it is not necessary to wait
until the next scheduled service to replenish the
fluid. Therefore, refill the DEF supply tank regu-
larly during vehicle operation or, at the latest,
after receiving the first warning message via the
on-board computer.
Low ambient temperatures
DEF freezes at a temperature of approximately
12‡(Ò11 †). The vehicle is equipped with a DEF
preheating system at the factory. Winter oper-
ation is therefore also guaranteed at tempera-
tures under 12 ‡ (Ò11 †).
iIf you add DEF at temperatures below 12 ‡
(Ò11 †) it is possible that the level is not
shown correctly due to the frozen DEF.
Drive for at least 20 minutes (heating phase in
the fuel tank activated) and then stop the
vehicle for at least 30 seconds. The level is
then shown correctly.
Additives
!Do not mix DEF with any additives and do
not dilute DEF with tap water. Otherwise, the
exhaust gas aftertreatment may be damaged.
Observe the MB Specifications for Service
Products, Sheet No. 352.0.
Damage that arises through the use of addi-
tives or tap water will invalidate the New Vehi-
cle Limited Warranty.
Storage
!Containers made of aluminum, copper, cop-
per alloys as well as unalloyed or galvanized
steel are not suitable for storing DEF. If stored
in these types of containers, DEF could cause
constituents of these metals to dissolve and
cause irreparable damage to the exhaust gas
aftertrea tment.
Da
mage caused by such impurities in the DEF
will invalidate the New Vehicle Limited War-
ranty.
Only store DEF in containers made of high-alloy
Cr‑ Ni steel or Mo ‑Cr‑Ni steel in accordance with
DIN EN 10 088 ‑1/2/3 or plastic containers
made of polypropylene or polyethylene.
Purity
!Impurities in DEF (e.g. caused by other ser-
vice products, cleaning agents, dust, etc.)
result in increased emissions, malfunctions,
catalytic converter damage or engine dam-
age.
The purity of DEF is essential to prevent mal-
functions in the exhaust gas aftertreatment.
If DEF is pumped out of the DEF tank, e.g. during
repair work, the same liquid must not be used to
refill the tank. Its purity is no longer guaranteed.
Service products and capacities281
Technical data
Z