Mercedes-Benz ML350 Operator's Manual page 387

Practical hints
What to do if ...
Problem
?
(USA only) The yellow engine malfunction
indicator lamp comes on while
±
(Canada only)
driving.
386
Possible cause Suggested solution
A loss of pressure has been
detected in the fuel system.
If it is not closed properly:
The fuel cap may not be closed
properly or the fuel system
may be leaky.
If it is closed properly:
Your fuel tank is empty.
The limp-home mode is canceled. You do
not need to have your vehicle checked.
Check the fuel cap ( page 323).
Close the fuel cap.
Have the fuel system checked by an
authorized Mercedes-Benz Light Truck
Center.
After refueling start, turn off and
restart the engine three or four times in
succession.