On some vehicles, my dodge in particular, the def gauge is like a sonar, it looks through the fluid to the top, does a math thing and determines the amount of def in the tank. I found when the tank got low, filler her all the way up. After about three engine cycles, the gauges read properly again.
Just a thought.
Terry
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Terry and Geri
2017 Four Winds 35SD
2020 Grand Cherokee Toad
Semper Fi
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