Troubleshooting
291
Problem
Possible cause/consequence Suggested solutions
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring.
There is a malfunction in the
engine electronics or a mechani-
cal component of the engine con-
trol unit.
X
Only depress the accelerator pedal slightly.
X
Have the cause rectified immediately at a qualified specialist work-
shop.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
A coolant temperature of over
120 °C is displayed. You also
hear a warning signal.
The coolant level is too low. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently.
X
Stop as soon as possible and allow the engine and the coolant to
cool down.
X
Check the coolant level (
Y
page 223). Observe the warning notes
as you do so and top up the coolant if necessary.
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.
X
If the coolant temperature is less than 120 °C, you can continue
driving to the nearest qualified specialist workshop.
X
Avoid heavy loads on the engine as you do so, e.g. driving on
mountain roads and stop/start driving.
The engine does not switch off.
The ignition lock is faulty.
X
Open the fuse box in the engine compartment (
Y
page 334).
X
Remove fuse 120 using the fuse extractor.
The engine stops.
If you wish to start the engine again:
X
Replace the fuse.
Practical advice
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