My dads 2015 F250 (123k miles) is throwing this code with the check engine light. Google says it's a Reductant Level Sensor C Circuit High
Something to do with the sensor that determines the DEF level.
Anyone experience this? Is this a DIY job or what? (Were Not mechanics by any means, but know how to follow instructions and can turn wrenches)
He was already thinking of deleting the DEF and going that route before all of this, will that fix it?

I had that at one time when I had my 250 and it would go off once my DEF got below that particular sensor. I'd fill the DEF and it would go away. As long as I kept the DEF pretty full I never saw the CEL but whenever it popped up topping off the DEF made it go away.

DEF/EGR Delete Kit

Update:

Topped off the DEF tank yesterday and the CEL turned off this morning. Go figure...

Thanks for the replies