My Durango thru a P0056 two months ago and it ended up being an O2 sensor. I changed it with an after market one and still thru the same code. I had to buy an O2 sensor from the dealership. No codes yet and it's been 2 months now. Some sensor has to be Mopar ones.

[img]http://www.imgur.com/hxlGUJt.gif[/img]
4-speed
3:54 Dana
13.01 @107.93 with street tires (not hooking up)