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My 14 F350 had some false DEF readings. After much discussion with mechanics and a friend in the equipment industry (having DEF issues), we sort of concluded that keeping the def tank full was the way to go. Def leaves behind that crystalline residue as it dries out. I see it around the fill spout. We surmised that these crystals in a low tank interfere with the sensor reading. Keeping the tank full keeps the crystals from forming. My ford sensor is supposedly like a fuel tank sensor and not an rv tank sensor so the crystals may cause the false warning. Since practicing “full def tank”, no issues. Just my opinion..
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