Mercedes-Benz C-Sedan 2015 Owners Manual - Manual (Page 293)

Engine
Warning/
indicator
lamp
N N Signal type
Possible causes/consequences and M
M Solutions
; N The yellow Check Engine warning lamp lights up while the engine is running.
There may be a malfunction, 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 gasoline engines)
R in the fuel system
The emission limit values may be exceeded and the engine may be in emer-
gency mode.
X Have the vehicle checked as soon as possible at a qualified specialist work-
shop.
In some states, you must immediately visit a qualified specialist workshop as
soon as the yellow Check Engine warning lamp lights up. This is due to the legal
requirements in effect in these states. If in doubt, check whether such legal
regulations apply in the state in which you are currently driving.
8 N The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
X
Refuel at the nearest gas station.
8 N The yellow reserve fuel warning lamp flashes while the vehicle is in motion.
In addition, the ; Check Engine warning lamp may light up.
The fuel system pressure is too low. The fuel filler cap is not closed correctly
or the fuel system is leaking.
X
Check that the fuel filler cap is correctly closed.
X If the fuel filler cap is not correctly closed: close the fuel filler cap.
X If the fuel filler cap is closed: visit a qualified specialist workshop.
? N The red coolant warning lamp lights up while the engine is running and the
coolant temperature gage is at the start of the bar display.
The temperature sensor for the coolant temperature gage is defective.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
X Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions. Do not continue driving under any
circumstances.
X
Secure the vehicle against rolling away (
Y
page 174).
X
Consult a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster
291
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