Mercedes-Benz 2003 M-Class Operator's Manual page 232

Practical hints
What to do if ...
Problem
? The yellow "CHECK ENGINE"
malfunction indicator lamp
comes on while driving.
7 The indicator lamp lights up.
232
Possible cause
There is a malfunction of:
The fuel management system
The ignition system
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.
The fuel cap is not closed tightly.
Your fuel tank is empty.
TM
A BabySmart child seat is installed on the
front passenger seat. The front passenger
airbag is therefore switched off.
The system is malfunctioning when there is
TM
no BabySmart child seat installed on the
front passenger seat.
Suggested solution
Have the vehicle checked as soon as
possible by an authorized
Mercedes-Benz Light Truck Center.
An on-board diagnostic connector is
used by the service station to link the
vehicle to the shop diagnostics sys-
tem. It allows the accurate identifica-
tion of system malfunctions through
the readout of diagnostic trouble
codes. It is located in the front left
area of the footwell next to the park-
ing brake pedal.
Check the fuel cap ( page 200).
After refuelling start the engine three
or four times in succession.
The limp-home mode is canceled. You do
not need to have your vehicle checked.
Have the system checked as soon as
possible by an authorized
Mercedes-Benz Light Truck Center.