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Practical hints
What to do if …
Problem Possible cause Suggested solution
? The yellow “CHECK ENGINE”
malfunction indicator lamp
comes on while driving.
There is a malfunction of:
ț The fuel management system
ț The ignition system
ț The emission control system
ț Systems which impact emissions
Such malfunctions may result in excessive
emissions values and may switch the engine
to its limp-home (emergency operation)
mode. Serious damage can occur to the
emission system.
̈ 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 near the hood lock
release on the upper left of footwell.
The fuel cap is not closed tightly. ̈ Check the fuel cap.
Your gas tank is empty. ̈ After refuelling, start the engine three
or four times in succession. The
limp-home mode is canceled.
< The red seat belt warning lamp
blinks for a brief period after
starting the engine.
The warning lamp reminds you to fasten seat
belts.
̈ Fasten your seat belt.
The yellow fuel tank reserve warning lamp
illuminates while driving.
The fuel level has gone below the reserve
mark.
̈ Refuel at the next gas station.
̈ Also note the messages in the multi-
function display (
୴ page 246).