P207F - Abnormality of DEF solution quality

MolynTruck

New Recruit
Owner/Operator
I have been getting this error message for the last month. 2014 Hino 268, wiith about 338k miles. Tried steps on youtube and other resources to take care of it but nothing seems to work. I replaced the Def level/quality senor, nox sensors, Ignitor Plugs and the nozzle.

The truck typically runs 100 miles before the warning comes on. Once I reset the scr memory, it sometimes run for 200+ miles, or sometimes only go 20 miles before I have to reset again. I have changed the DEF fluid per the warning but doesn't seem to do anything. I have used the DEF in box and from the Pilot fuel station and still the same thing.

Does anyone have any suggestions as what else could be causing the issue?
 
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