ive got a 2005 f-150 4.6 4x4 and am getting p0401 code. ive cleaned the throttle body and all ports cleaned to egr tube to the manifold. still getting code light pops on about 5 minutes down the road after. I ordered a new egr valve ($135.00) and was going to replace to dpfe sensor as well but i was told by a friend that it might be incorporated into the egr valve in that year. anybody know if it is ? thanks in advance