Problem
Possible causes/consequences and
X
X
Solutions
Vehicles with a petrol
engine:
The engine is not run-
ning smoothly and is
misfiring.
There is a malfunction in the engine electronics or a mechanical
component of the engine control unit.
X
Only depress the accelerator pedal slightly.
X
Have the cause rectified immediately at a qualified specialist
workshop.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it.
The coolant tempera-
ture gauge shows a
value above 120 †.
The coolant warning
lamp may also light up
and a warning tone may
sound (
Y
page 227).
The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X
Stop as soon as possible and allow the engine and the coolant
to cool down.
X
Check the coolant level (
Y
page 316). 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 †, 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.
Automatic transmission
Problem
Possible causes/consequences and
X
X
Solutions
The transmission has
problems shifting gear.
The transmission is losing oil.
X
Have the transmission checked at a qualified specialist work-
shop immediately.
The acceleration ability
is deteriorating.
The transmission no
longer changes gear.
The transmission is in emergency mode.
It is only possible to shift into second gear and reverse gear.
X
Stop the vehicle.
X
Turn the key in the ignition to position 0 (
Y
page 192) or press
the Start/Stop button* repeatedly until all indicator lamps in
the instrument cluster go out.
X
Wait at least 10 seconds before restarting the engine.
X
Have the transmission checked at a qualified specialist work-
shop immediately.
386
Troubleshooting
Practical
advice
* optional
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