Diesel, DPF, DEF & EGRNewsCommunity Starter

2024 Toyota Tacoma TRD Off-Road — question: DEF warning came back shortly after refill

JDMEnthusiastCommunity StarterJul 1, 20262024 Toyota Tacoma TRD Off-RoadPennsylvania
2024 Toyota Tacoma TRD Off-Road, about 48,000 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? Trying to diagnose before I book a shop. Ambient temp was about 72°F when I noticed it.
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