Mercedes-Benz E 2008 Series Owner's Manual page 299

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Practical advice
Troubleshooting
Problem
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring.
A coolant temperature of over
120 °C is displayed. The coolant
warning lamp may also be on and
a warning tone may sound
( page 120).
Y
296
Version: 2.9.4
Possible cause/consequence
There is a malfunction in the
engine electronics or a mechani-
cal component of the engine con-
trol unit.
The coolant level is too low. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently.
If the coolant level is correct, the
radiator fan may be faulty. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently.
Suggested solutions
Only depress the accelerator pedal slightly.
X
Have the cause rectified immediately at a qualified specialist work-
X
shop.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
Stop as soon as possible and allow the engine and the coolant to
X
cool down.
Check the coolant level ( page 225). Observe the warning notes
X
Y
as you do so and top up the coolant if necessary.
If the coolant temperature is less than 120 °C, you can continue
X
driving to the nearest qualified specialist workshop.
Avoid heavy loads on the engine as you do so, e.g. driving on
X
mountain roads and stop/start driving.