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Low DEF Pressure FIX

SPN 4364 FMI 18, Def doser valve, failed regen

CUMMINS DEF FAULT CODES SERVICE DEF COMON PROBLEMS

Aftertreatment 1 Diesel Exhaust Fluid Line Heater 3 Circuit - Voltage Below Normal KW T680 2019

NOx efficiency low, SPN 4364 FMI 1 and 18. SPN 3364 FMI 2 and 17. Try this work first.

Freightliner DEF air pressure air low - fault 4335 fmi 7 def air pressure sensor

Freightliner cascadia spn 3936 fmi 18

Detroit DD13 DD15 DD16 SCR Fault Code 4364 18

Solved Air Intake Problem Detected SPN 102 FMI 18
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Last Updated: August 6, 2026
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