Inspect DEF pump filter


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Inspect DEF pump filter

Replace DEF filter using 1 1/16 socket For testing purposes, remove filter, put the cover back, Disconnect doser valve def line at doser to avoid dirt clog at doser tip. Run truck at higher Rpm for 7 mins Shut off truck then turn it back on. Inspect if faults still exists. Recommended Def filter replacement every 120-150k miles