Rinse any affected areas off with plenty of
clean water. Consult a doctor if necessary.
i
If the DEF level has dropped below the
reserve range, add at least 2.0 US gal
(7.6 l) of DEF at the latest after receiving the
second warning message (Y page 182).
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 register
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 318).
Refueling procedure
DEF filler neck
Non-lockable DEF filler cap
Example: DEF filler cap in the engine compartment
X
To open: switch off the ignition.
X
Open the hood (Y page 248).
X
Turn filler cap : counter-clockwise and
remove it.
X
To close: replace cap : on the filler neck
and turn it clockwise.
You will hear a click when cap : is fully
closed.
X
Close the hood (Y page 249).
Lockable filler cap
Example: DEF filler cap in the engine compartment
X
To open: switch off the ignition.
X
Open the hood (Y page 248).
X
Remove tool ? for unlocking tank filler
cap : from the footwell on the co-driver's
side (Y page 274).
X
Pull cover = up, turn 90° and release.
X
Insert tool ? into hole ; of tank filler
cap :.
X
Turn filler cap : counter-clockwise and
remove it. Make sure that tool ? remains
in tank filler cap : while doing so.
X
To close: replace filler cap : and turn it
clockwise until closed.
X
Pull tool ? out of tank filler cap : and
stow with the vehicle tool kit in the footwell
on the co-driver's side.
X
Pull cover = up over hole ; of tank filler
cap :, turn and release.
X
Turn tank filler cap :.
If tank filler cap : turns freely, the DEF
tank is closed.
148
Refueling
Driving and parking
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