Diesel, DPF, DEF & EGRQuestionCommunity Starter

2015 Volkswagen Golf — dEF warning came back soon after refill — second opinion before I spend money

DailyCommuter815Community StarterNov 20, 20252015 Volkswagen Golf TDINorth Jersey
2015 Volkswagen Golf TDI, about 125,000 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? Interested in real owner experience more than guesses.
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