Diesel, DPF, DEF & EGRQuestionCommunity Starter

2005 Ford F-250 — dEF warning came back soon after refill — trying to narrow this down

CleanDad31Community StarterMay 14, 20262005 Ford F-250 6.0 Power StrokeOrlando
2005 Ford F-250 6.0 Power Stroke, about 227,000 miles. DEF was filled recently but the warning returned. Before assuming the level sensor failed, can fluid quality, crystallization or heater issues produce the same symptoms?
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