Just a quick tip for those that are new to Diesels with all of the newer emission controls. DEF apparently has a shelf life and using anything other than DEF bought from the dealer may void your warr...
There was a thread sometime back now about a recall from Ford I believe on bad NOX sensors. Believe it was ambulance packages that got front row on this one, but pertained to the 6.7L diesel.
Directly pertains as I believe it is these same sensors connected to the good verus bad DEF being discussed here.