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Found the issue lol i needed a new battery as well as i added some more def to tank and put a couple lucas fuel treatment bottles in and it fixed issue
Low battery can do some strange things on these trucks.
I did have NOx sensor go back and it was replaced. That was within the first two years of ownership. Last year I had a similar error pop up but it was resolved with a software update to the system, covered under some Ford program.
Below is a picture of what i just got on my phone that turned on the check engine light.
I hade the same error code. Took it to the dealer and they had to replace a wiring harenss. Cost about $1200. I could tell the difference after the fix with take off and fuel economy