spark plugs MERCEDES-BENZ M-Class 2012 W166 Owner's Manual

Useful
information
i This
Operat or'sManual describesall
models andallstan dard andoption al
equipment ofyour vehicle available atthe
time ofpublication ofthe Operat or's
Manual. Country-specificdiffer encesare
possible. Pleasenotethat your vehicle may
not beequipped withallfeature s
descr ibed. Thisalso applies tosafet y-
related systemsand func tions. i
Please
readtheinfor mation onqualified
specialist workshops(Ypage 25). Engine
compartment Hood
Opening thehood G
WARN
ING Do
not pull therelease leverwhile thevehicle
is in mot ion. Othe rwise, thehood could be
forc edopen bypassing airflow.
This could cause thehood tocome looseand
inj ure you and/o rothe rs. G
WA
RNING Do
not open the hoodwh en the engineis
ove rheated.Yo ucou ldbe serio uslyinju red.
Ob serve the coolant temp eraturedisp layto
de term inewheth erthe enginemaybe
ove rheated.Ifyo use efla mes orsmo ke
comi ngfromthe enginecomp artment, move
aw ay fromt hevehicle. Waituntiltheengine
has cooled. Ifnecessary, callthefire
department. G
WARNING There
isarisk ofinjury ifthe hood isopen,
even ifthe engine isnot running.
Some engine componen tscan become very
hot.
To avoid therisk ofburns, onlytouch those
componen tsdescribed inthe Operator's
Manual andobserve therelevant safetynotes. G
WARNING To
help prevent personal injury,stayclear of
moving partswhen thehood isopen andthe
engine isrunning.
The radiator fanmay continue torun for
approximately 30seconds ormay even
restart aftertheengine hasbeen turned off.
Stay clear offan blades. G
WARNING Vehicles
withgasoline engine:
The engine isequipp edwith atransist orized
ignition system. Because ofthe high voltage
it is dangerous totouch anycomponen ts
(ignition coils,spark plugsocket s,diagnostic
socket )of the ignition system
R with theengine running
R while startin gthe engine
R when theignition isswitched onand the
engine isturned manually G
WARNING Vehicles
withdiesel engine:
The engine isequipp edwith ahigh-voltage
electronic controlunit forthe inject ion
system. Because ofthe high voltage itis
dangerous totouch anycomponen tsof the
inject ionsystem (injectors,electrical wires)
R with theengine running
R while startin gthe engine
R when theignition isswitched on
X Make surethatthewindshield wipersare
switched off. G
WARNING The
windshield wipersandwiper linkage
could beset inmotion.
When thehood isopen, youorothers could
be injured bythe wiper linkage.
Make surethatthewindshield wipersare
switched off.Remove theSmartKey ormake
sure thatnoignition position hasbeen
selected withKEYLES S-GO.Allindicator
lamps mustbeoff inthe instrumen tcluster. 312
Engi
necompar tmentMaintenance and care