Mercedes-Benz S-Class 2011, Operator'S Manual

Page: 401 / 524

Display messages Possible causes/consequences and
M
Solutions
?
The engine fan is faulty.
X
At coolant temperatures below 248 ‡ (120 †), continue driving
to the next qualified specialist workshop.
X
Avoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-start driving.
#
The battery is not being charged.
Possible causes are:
R
a faulty alternator
R
a torn poly-V-belt
R
a malfunction in the electronics
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X
Open the hood.
X
Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X
Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X
Visit a qualified specialist workshop.
4
Check Engine Oil at
Next Refueling
Vehicles with oil dipstick: the oil level has dropped to a critical
level.
X
Check the oil level (
Y
page 447).
X
If necessary, add the engine oil (
Y
page 449).
X
Have the engine checked for leaks if engine oil has to be added
more often than usual.
4
Check Engine Oil
Level(Add 1 quart)
(USA only)
Check Engine Oil
Level(Add 1 Liter)
(Canada only)
Vehicles without an oil dipstick: the engine oil level is too low.
X
Check the oil level (
Y
page 447).
X
If necessary, add the engine oil (
Y
page 447).
X
Have the engine checked for leaks if engine oil has to be added
more often than usual.
Information on approved engine oils can be obtained from any qualified specialist workshop
or on the Internet at http://www.mbusa.com (USA only).
! The oil level is too low. Avoid long journeys with too little engine oil. There is a risk of
engine damage.
Display messages
399
On-board computer and displays
Z