Wondering if this is a pattern failure.

Has anyone else seen P203B (reductant Level Sensor A Circuit Range/Performance) errors.
To my knowledge my DEF tank is full (If I am to believe the gauge). The DEF tank should be full given my historical consumption rate/mileage as well as the fact that I recently topped off the DEF tank when it was about 1/2 full.

 

What did you end up finding on this? I'm getting the same thing, but found this thread which may point the issue to the batteries (and I tend to believe it):

https://www.ford-trucks.com/forums/1...203b-code.html

 

Dealer replaced the DEF tank Level Sensor.

 

Well hell....I was hoping it was something as simple as a battery issue with you too. I'm assuming you haven't had the issue since they replaced the sensor? Are your batteries in good shape/still the same from the factory?