Mercedes-Benz E-Class Sedan Operator's Manual page 394

392 Display messages and warning/indicator lamps
Display messages
Possible causes/consequences and
* The radar sensor system is malfunctioning. Possible causes are:
soiling of the sensors
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heavy rain
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extended driving on inter-urban roads without moving traffic, e.g. in the desert
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Driving systems and driving safety systems may be malfunctioning or temporarily unavailable.
When the causes no longer apply, driving systems and driving safety systems are available again.
If the display message does not disappear:
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
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Clean all sensors .
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Restart the engine.
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