DEF Mileage down

The metering can be adjusted. Have it flow checked. Had a few that dropped all of a sudden from 250mpg to 180mpg.

 

that one box is pretty expensive

 

have you check the def filter

 

Sorry your going through that .My 2012 caused me so many problems but usually when my DEF mileage dropped it was a knox sensor getting ready to go ,good luck i finally did a delete after replacing the knox sensors more times than I can remember and everything else from harnesses to the one box and continued to have problems until the delete been 3 yrs and no problems

 

Ya good luck on finding someone have reputable to it. The EPA starting cracking down and given out HUGE fines to companies doing it. If ya do find someone you can trust. PM it to me.