Engine Code Help

[V8powerbaby]

Well ive been haveing these codes show up for awhile and have no idea what they are the codes are P0401 P0800 B0440 i have no idea what they are any help would be great. Engine runs fine and i cant notice anything wrong either

 

[V8powerbaby]

bump

 

[rodger9221]

code p0401 is Egr sensor, also known as dpfe on our trucks. I have the same code and just priced replacement part at Oreily's $80 for Lifetime warranty and $55 for 1 yr warranty

 

[Tbars4]

B0440 Evaporative Emission Control System Malfunction (Body code)..
P0800 Transfer Case Control System (MIL Request)

...You might read post #15,#20,and #21 of this thread..
http://www.explorerforum.com/forums/showthread.php?t=154316&highlight=p0800