Mercedes-Benz 2009 CLS-Class Operator's Manual page 300

Practical hints
What to do if ...
Engine
Problem
ú (USA only)
± (Canada only)
The yellow engine malfunction
indicator lamp comes on when
the engine is running.
ú (USA only)
± (Canada only)
The yellow engine malfunction
indicator lamp comes on when
the engine is running.
298
Possible cause/consequence
There may be a malfunction in:
The fuel management system
R
The ignition system
R
The emission control system
R
Systems which affect emis-
R
sions
Such malfunctions may result in
excessive emissions values and
may switch the engine to limp-
home (emergency operation)
mode.
A loss of pressure has been
detected in the fuel system. The
fuel cap may not be closed prop-
erly or the fuel system may be
leaky.
Suggested solutions
X
Have the vehicle checked as soon as possible at an authorized
Mercedes-Benz Center.
i Some states may by law require you to visit a workshop as soon
as the engine malfunction indicator lamp comes on. Check local
requirements.
X
Check the fuel cap ( Y page 197).
X
If it is not closed properly: Close the fuel cap.
X
If it is closed properly: Have the fuel system checked by an
authorized Mercedes-Benz Center.