Mercedes-Benz C-Class, Owner'S Manual

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Engine
Warning/
indicator
lamp
N N Signal type
Possible causes/consequences and M M Solutions
; N The yellow engine diagnostics warning lamp lights up while the engine is
running.
There may be a fault, for example:
R
in the engine management
R
in the fuel injection system
R
in the exhaust system
R
in the ignition system (for vehicles with petrol engines)
R
in the fuel system
The emission limit values may be exceeded and the engine may be running in
emergency mode.
X
Have the vehicle checked as soon as possible at a qualified specialist work-
shop.
Vehicles with a diesel engine: the fuel tank has been run dry (
Y
page 203).
X
Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergency running
mode is cancelled. The vehicle need not be checked.
8 N The yellow reserve fuel warning lamp is on while the engine is running.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops into the
reserve range.
X
Refuel at the nearest filling station.
? N The red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the bar display.
The temperature sensor for the coolant temperature gauge is faulty.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
X
Stop the vehicle immediately, paying attention to road and traffic condi-
tions, and switch off the engine. Do not continue driving under any circum-
stances.
X
Secure the vehicle to prevent it from rolling away (
Y
page 207).
X
Consult a qualified specialist workshop.
360
Warning and indicator lamps in the instrument cluster
On-
boar
d
comp
ut
er
and
dis
pla
ys