M Mr Zoom Zoom Newbie May 27, 2007 #1 Joined Apr 25, 2007 Messages 7 Likes 0 Points 0 May 27, 2007 #1 A buddy of mine has a 2004 Caravan. The OBD reading gave a code P0406 which is the EGR Flow Sensor A Circuit Low Input. Is this sensor easily replaceable and if so any tips on how to replace it? ???