Engine
Warning/
indicator
lamp
N
Signal type
Possible causes/consequences and
M
Solutions
;
N
The yellow engine diagnostics warning lamp lights up while the engine is run-
ning.
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 as a result and the engine may be
running in emergency mode.
X
Have the vehicle checked as soon as possible at a qualified specialist workshop.
æ
N
The yellow reserve fuel warning lamp is on while the engine is running.
The fuel level has dropped to 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 comes on while the engine is running.
On vehicles without steering wheel buttons, the coolant temperature gauge is at
the start of the bar display (
Y
page 224).
On vehicles with steering wheel buttons, the coolant temperature gauge is at the
start of the scale in the instrument cluster (
Y
page 40).
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 conditions,
and switch off the engine. Do not drive on.
X
Secure the vehicle to prevent it from rolling away (
Y
page 177).
X
Consult a qualified specialist workshop.
Warning and indicator lamps on the instrument cluster
285
On-board computer and displays
Z
