2008 6.4 defueling

[BKOESTER26]

I have a 2008 6.4 and went to work about 60 miles and returned to drop off a coworker after work and drove another 60 miles and all of a sudden it starts going into defueling mode due to pyro 1 sensor. Could this have anything to do with clogged *** filter. Checked coolant. not bubbling or over heating. what else could i look at?

 

[BKOESTER26]

any help with this?

 

[powerstroked08]

Had this happen to a work truck a couple times. It was one of the dee pee f sensors.