your DEF might have something in the tank besides DEF. Maybe water was added? Or someone put diluted DEF in the tank? Or maybe even diesel in the DEF tank? Try pumping the tank out and see what the DEF looks like.

You can get a pump at Harbor Freight or Wal Mart.

You can download the OBDII for your year truck here from Ford...

https://www.motorcraftservice.com/freeresources/obd

 

So P207F is Reductant (DEF) Quality Perfomance. So in my thinking after reading the OBDII section is it's either a bad NOx sensor (hopefully), a bad NOx sensor module or a bad SCR. Which brings me back to my need for a service manual or knowledge of how to, if even possible, test the sensor and module with just a multi meter or other simple tools. Trying to avoid the stealership at all costs

I really don't think it is contaminated DEF, only I drive the truck and put fuel/DEF in it, and I definitely didn't put fuel or just water in the DEF tank. I always fill it up with Peak blue DEF from a sealed container as that is what is available readily around here.

 

Here is some of the info you seek

You may have to print the stuff and then put it in order

may take a couple replies

 

#2 post.....one more after this one

 

last post....hope these are what you seek and help you

 

@Larry1013 those screen shots are great. I'll get to testing them tomorrow. Thank you very much

 

well after testing with the info on the pages posted above I'm pretty sure it's the NOx sensor, but I'd rather not give Ford almost $400 for a new one. Anyone out there have one lying around after deleting your truck? I'd rather throw a good used one in for the time being and just get rid of this truck