Fuel Tank - Mercedes-Benz R-Class Owner's Manual

Warning and indicator lamps in the instrument cluster
Engine
Problem
;
The yellow engine diag-
nostics warning lamp
lights up while the
engine is running.
The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning.
Possible causes/consequences and M Solutions
There may be a fault, for example:
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
R
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 workshop.
Vehicles with a diesel engine: the fuel tank has been run dry
( Y page 157).
X
Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emer-
gency running mode is cancelled. The vehicle need not be
checked.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated when the fuel level
drops into the reserve range.
X
Refuel at the nearest filling station.
241
Z