355 Practical hints
What to do if …
Problem
Possible cause
Suggested solution
?
 (USA only)
±
 (Canada only)
The yellow engine mal-
function indicator lamp 
comes on while driving.
There is a malfunction in:
The fuel management system
The ignition system (Gasoline engine)
The emission control system
Systems which affect emissions 
Such malfunctions may result in excessive 
emissions values and may switch the engine 
to its limp-home (emergency operation) 
mode.
Have the vehicle checked as soon as possible 
by an authorized Mercedes-Benz Center.
An on-board diagnostic connector is used by 
the service station to link the vehicle to the 
shop diagnostics system. It allows the accu-
rate identification of system malfunctions 
through the readout of diagnostic trouble 
c odes . I t is  loc a ted i n the f ront l ef t a re a of  the 
footwell next to the parking brake.
A loss of pressure has been detected in the 
fuel system. The fuel cap may not be closed 
properly or the fuel system may be leaky.
Check the fuel cap.
If it is not closed properly:
Close the fuel cap.
If it is closed properly:
Have the fuel system checked by an autho-
rized Mercedes-Benz Center.
Your fuel tank is empty.
After refuelling start, turn off and restart the 
engine three or four times in succession. 
The limp-home mode is canceled. You do not 
need to have your vehicle checked.