Mercedes-Benz A-Class Series Owner's Manual page 189

Warning and indicator lamps in the instrument cluster
186
Engine
Problem
;
The yellow engine diag-
nostics warning lamp
lights up while the
engine is running.
;
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
the fuel system
R
The emission limit values may be exceeded and the engine may
be running in emergency mode.
Have the vehicle checked as soon as possible at a qualified
X
specialist workshop.
Vehicles with a diesel engine: the fuel tank has been run dry
( page 126).
Y
Start the engine three to four times after refuelling.
X
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.
Refuel at the nearest filling station.
X