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194 Engine, exhaust system and fuel ›
Troubleshooting
Coolant level is too low
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or
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Message concerning the required coolant
check
›
Check the coolant level.
The coolant level is OK:
›
Check the fuse for radiator fan, replace if re-
quired
» page 201, Replacing a
The fuse is OK, the indicator light comes on again:
›
Stop driving! Seek the help of a specialist garage.
Coolant temperature too high
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or
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Report regarding the engine overheating
›
Stop driving.
›
Stop the engine and allow it to cool.
›
Drive on after the indicator light goes out.
Engine fault
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or
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›
Stop driving!
›
Stop the engine and seek the help of a specialist
garage.
There is no coolant of the correct specification
available
›
Top up with distilled or demineralised water.
›
Have the correct coolant mixing ratio corrected by
a specialist garage as soon as possible.
Another substance was used for topping up, other
than distilled or demineralised water:
›
Have the coolant changed by a specialist garage.
It is not possible to top up with a sufficient amount
of coolant
›
Stop driving.
›
Stop the engine and seek the help of a specialist
garage.
There is a loss of coolant
›
Top up the coolant and seek the help of a specialist
garage.
Engine electronics
Engine electronics
Troubleshooting
Petrol engine control faulty
noticeable reduction in engine performance may oc-
cur.
›
Diesel engine control faulty
fuse.
Driving in emergency mode is possible - a noticeable
reduction in engine performance may occur.
›
Diesel preheating system faulty
Driving in emergency mode is possible - a noticeable
reduction in engine performance may occur.
›
Particle filter
Troubleshooting
Clogged particle filter
or
›
sumed that fuel consumption will be higher, engine
power will be reduced, and the START-STOP func-
tion will not be available.
Filter cleaning
Conditions for cleaning
✓ The engine is warm.
✓ For vehicles with manual transmission, observe
Procedure for vehicles with diesel engines
›
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Driving in emergency mode is possible - a
Continue driving, exercising appropriate caution,
and seek the help of a specialist garage.
flashes
Continue driving, exercising appropriate caution,
and seek the help of a specialist garage.
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ignition is switched on
Continue driving, exercising appropriate caution,
and seek the help of a specialist garage.
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Clean the filter.
When the indicator light is on, it must be as-
the gear recommendation shown in the display of
the instrument cluster.
Drive at a speed of at least 60 km/h at engine
speeds of at least 2000 rpm.
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