2009 Mercedes E-Class Owner's Manual - Page 172

Controls in detail Driving systems In such a case, Distronic will switch off, and the message DISTRONIC Currently Unavailable - See Operator's Manual appears in the multifunction display. For cleaning and care of the Distronic system sensor cover, see (Y page 285). Offset driving Distronic has not yet detected the vehicle changing lanes. There will be insufficient distance to the lane-changing vehicle. Narrow vehicles i If the message DISTRONIC Currently Unavailable - See Operator's Manual disappears during driving and the last set speed flashes for approximately 5 seconds, the dirt (e.g. slush) has dissolved; Distronic works again. Turns and bends A vehicle traveling in your lane but offset from your direct line of travel may not be detected by Distronic. There will be insufficient distance to the preceding vehicle. Lane changing Because of their narrow profile, the vehicles traveling near the outer edges of the lane have not yet been detected by Distronic. There will be insufficient distance to the preceding vehicles. 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. 170