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Practical hints
What to do if …?
Problem Possible cause/consequence Suggested solution
ú
±
(USA only)
(Canada only)
The yellow engine malfunction
indicator lamp comes on while
driving.
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 (୴ page 320).
If it is not closed properly:
̈ Close the fuel cap.
If it is closed properly:
̈ Have the fuel system checked at an autho-
rized Mercedes-Benz Center.
• The red coolant warning lamp
comes on when the engine is run-
ning.
There is insufficient coolant in the
reservoir.
̈ Add coolant to prevent engine from overheat-
ing (
୴ page 328).
If this warning lamp comes on fre-
quently, there is a leak in the cooling
system.
̈ Have the cooling system checked.
If the coolant level is correct, the
electric radiator fan may be broken.
̈ If the coolant temperature is below 248°F
(120°C), you can continue driving to the
nearest authorized Mercedes-Benz Center.
̈ Avoid high engine loads (e.g. driving uphill)
and stop-and-go driving.