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  1. DEF Low light on, DEF tank full - need advice

    Diesel Promaster Discussion
    2014 159" Diesel 52,000 miles. Wondering if anyone has ever had this happen: The DEF Low Refill Soon message appeared, but the tank is full. My mechanic (not a dealer shop) is able to imitate the sensor with the scan tool so we are pretty sure it not an electrical issue. Could the tank level...
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