Problem
Possible causes/consequences and
X
X
Solutions
The engine will not
start. You cannot hear
the starter motor oper-
ating.
The on-board voltage is too low because the starter battery is too
weak or discharged.
X
Jump-start the vehicle (
Y
page 234).
If the engine does not start despite attempting to jump-start it:
X
Consult a qualified specialist workshop.
The starter motor was exposed to a thermal load that was too high.
X
Allow the starter motor to cool down for approximately two
minutes.
X
Try to start the engine again.
If the engine still does not start:
X
Consult a qualified specialist workshop.
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 90).
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 149). 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.
208
Troubleshooting
Practical
advice
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