No this is not possible. Modern Land Rovers are PERMANENT 4wd This does not however effect gas mileage so there is no reason to have the desire to reconfigure it to 2wd.
The 4 wheel drive system on a 2002 Land Rover Discovery is engaged by pressing the 4 wheel drive button on the dash. It sends an electrical signal which activates the system.
The 2001 Land-Rover Range-Rover has four wheel drive.
The 2010 Land-Rover Range-Rover has four wheel drive.
The 2014 Land-Rover Range-Rover has four wheel drive.
The 2009 Land-Rover Range-Rover has four wheel drive.
The 2004 Land-Rover Range-Rover has four wheel drive.
The 2013 Land-Rover Range-Rover has four wheel drive.
The 2003 Land-Rover Range-Rover has four wheel drive.
The 2012 Land-Rover Range-Rover has four wheel drive.
The 2011 Land-Rover Range-Rover has four wheel drive.
The 2005 Land-Rover Range-Rover has four wheel drive.
The 2006 Land-Rover Range-Rover has four wheel drive.