Mercedes-Benz 2005 E -Class Wagon Operator's Manual page 243

Controls in detail
Driving systems
The most likely cause for a malfunctioning
system is a dirty sensor (located behind
the hood grille), especially at times of snow
and ice or heavy rain. In such a case,
Distronic will switch off, and the message
Currently unavailable See Operator's
Manual appears in the multifunction
display.
For cleaning and care of the Distronic sen-
sor, see "Cleaning the Distronic* system
sensor cover" ( page 347).
242
i
If the message Currently unavailable
See Operator's Manual disappears
during driving and the last speed stored
flashes for approximately five seconds,
the dirt (e.g. slush) has dissolved;
Distronic works again.
Turns and bends
In turns or bends, Distronic may not detect
a moving vehicle in front, or it may detect
one too soon. This may cause your vehicle
to brake late or unexpectedly.