The
tirepressure monitordoes notwarn youof
an incorr ectlysettire pressure. Observethe
not eson the recomm endedtirepressure
(Y page 308).
The tirepressure monitorisnot able towarn
you ofasudden lossofpressure, e.g.ifthe
tire ispenetr atedbyaforeign object.In the
event ofasudden lossofpressure, bringthe
vehicle toahalt bybraking carefully. Avoid
abrupt steeringmovemen ts.
The tirepressure monitorhas ayellow warning
lamp inthe instr ument cluster forindicatin g
pressure lossoramalfunct ion.Whether the
warning lampflashes orlights upindicates
whether atire pressure istoo low orthe tire
pressure monitorismalfunct ioning:
R ifthe warning lampislit cont inuously, the
tire pressure onone ormore tiresissignifi-
cant lytoo low. Thetirepressure monitoris
not malfunct ioning.
R ifthe warning lampflashes foraround a
minute andthen remains litconst antly, the
tire pressure monitorismalfunct ioning.
In addition tothe warning lamp,amessage
appears inthe multifunct iondisplay .Observe
the inform ationondisplay messages
(Y page 224).
It may take uptoten minutes foramalfunc-
tion ofthe tire pressure monitortobe indica-
ted. Amalfunct ionwill beindicated bythe tire
pressure warninglampflashing forapprox-
imately oneminute andthen remaining lit.
When themalfunct ionhas been rectified, the
tire pressure warninglampgoesoutafter a
few minutes ofdriving.
The tirepressure valuesindicated bythe on-
board computer maydiffer fromthose meas-
ured atagas station withapressure gauge.
The tirepressures shownbythe on-board
computer refertothose measured atsea level.
At high altitudes, thetire pressure valuesindi-
cated byapressure gaugearehigher than
those shown bythe on-board computer. Inthis
case, donot reduce thetire pressures.
The operation ofthe tire pressure monitorcan
be affect edbyinter ferenc efrom radio trans-
mitt ingequipment (e.g.radio headphones,
two-way radios)thatmay bebeing operated in
or near thevehicle. Checking
thetire pressur eelectroni-
cally X
Make surethattheSmart Keyisin position
0048 inthe ignition lock(Ypage 125).
X Press 0059or0065 onthe steerin gwheel
to select theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press the0076 button .
The current tirepressure ofeach tireis
shown inthe multifunct iondisplay .
If the vehicle wasparked forlonger than
20 minutes, theTire pressure willbe Tire
pressure willbe
displayed afterdriving afew minutes displayed
afterdriving afew minutes
message isshown.
Aft erateach- inprocess, thetire pressure
monit orautomatically detectsnew wheels or
new sensors. Aslong asaclear allocation of
the tire pressure valuetothe individual wheels
is not possible, theTire Pressure Monitor Tire
Pressure Monitor
Active Active
message isshown instead ofthe tire
pressure display.The tirepressures are
already beingmonitored.
If an emergenc yspare wheel ismounted, the
system maycontinue toshow thetire pressure
of the wheel thathasbeen removed forafew
minutes. Ifthis occurs, notethat thevalue dis-
played forthe position wherethespare wheel
is fitt ed isnot thesame asthe current tire
pressure ofthe emergenc yspare wheel.
Tire pressur emonitor warning mes-
sages If
the tire pressure monitordetect sa pressure
loss inone ormore tires,awarning message is
shown inthe multifunct iondisplay .The yellow
tire pressure warninglampthenlights up.
R Ifthe Please Correct TirePressure Please
Correct TirePressure
message appearsinthe multifunct iondis-
play, thetire pressure inat least onetireis
too low. Thetirepressure mustbecorrec ted
when theopportunit yarises.
R Ifthe Check TirePressure Check
TirePressure message
appears inthe multifunct iondisplay ,the tire
pressure inone ormore tireshasdropped
significant ly.The tires must becheck ed.
R Ifthe Tire Pressure WarningTire Tire
Pressure WarningTire
Failure Failure
message appears,thetire pressure
in one ormore tireshasdropped suddenly.
The tires must becheck ed. 314
Tir
epr essureWheels andtires
X
Clean thewheel andwheel hubcontact sur-
fac es.
X Plac eth ene wwheel onthewheel huband
push iton .
X Tigh tenth ewheel boltsunt ilth ey are finger -
tig ht.
Loweri ngthevehi cle G
WAR
NING
The wheel sco uld come loos eif th ewheel
bolt sor wheel nutsare nottig hten ed tothe
pre scribe dtig hten ing torque .Ther eis aris k
of an acc iden t.
En sure that thewheel boltsor wheel nuts
are tighten ed tothepre scribe dtig hten ing
to rque.
If you arenotsure ,do notmov eth eveh icle.
Con tacta qualif iedspec ialist workshopand
have thetig hten ing torque check edimm edi-
ate ly.
X Plac eth erat chet wren chonto thehex agon
nut ofthejac kso that thelet ters AB are
vis ible.
X Turn therat chet wren chunt ilth eveh icle is
on ce again stand ingfirmly onthegro und.
X Plac eth ejac kto oneside. X
Tigh tenth ewheel boltseve nly inacr oss -
wise pattern intheseque nceind icat ed(0043
to 0083). Thespec ifiedtig hten ing torque is
96 lb-ft(130 Nm).
X Turn thejac kback toits initial posi tion.
X Stow thejac kand theres tof theveh icle
to ols intheveh icle again .
X Mer
cedes -AMGveh icles andvehicles
with AMG Line: usetheco ver oftheout er
sill.
X Chec kth etir epre ssur eof thene wly moun -
te dwheel andadjust itifne ces sary.
Obs erveth erec omm ended tirepre ssur e
(Y page 308).
Cana daonly: aslon gas you aredrivingwith
th eeme rgencyspar ewheel mounted, thetir e
pre ssur eloss warn ingsyst emcannotfun ction
reli ably. Onlyres tartth etir epre ssur eloss
warn ingsyst emwhen thedef ective wheel has
been replace dwit hane wwheel .
Veh icles withtirepr essu remon itor(USA
only) :all moun tedwheel smust beequipp ed
wit hfun ction ing sensors. Wh
eel and tirecomb inations Gener
alnot es
You canaskforinform ationreg ardin gper mit-
te dwheel /tire combin ationsatan auth orized
Mer cedes-Ben zCen ter.
You should regularly check thepre ssur eof the
eme rgencyspar ewheel ,part icular lyprio rto
lon gtrips, and correct thepre ssur eas neces -
sary (Ypage 308). The value onthewheel is
valid .
! For
safe tyreas ons,Mer cedes-Ben zrec om-
men dsthat you onlyuse tires and wheel s 330
Wh
eel and tirecomb inationsWheels andtires
