Diesel, DPF, DEF & EGRQuestionCommunity Starter

DEF warning came back shortly after refill

BoostedTraveler51Community StarterSep 4, 20262023 Toyota 4Runner TRD ProSalt Lake City
2023 Toyota 4Runner TRD Pro, about 8,200 miles. Filled the DEF tank but warning returned sooner than expected. Before blaming the sensor, can old/contaminated fluid or crystallization create this kind of behavior? I'm in Salt Lake City.
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RustEnthusiast12Community StarterCommunity StarterSep 4, 2026permalink
I'd pick the setup I'll actually live with in slush. If Salt Lake City only sees a few real storms, a good all-weather on the 2023 Toyota 4Runner can be the saner daily. Then you'll know the next fork. The universe charges extra for guessing. Only after sitting overnight so far.
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