Understanding SPN 4356/FMI 5 Fault Code SPN 4356/FMI 5 is a diagnostic trouble code (DTC) indicating a Line Heater 3 Open Circuit in the Diesel Exhaust Fluid (DEF) ..
Understanding SPN 4354/FMI 5: Diesel Exhaust Fluid Line Heater 1 Open Circuit What is SPN 4354/FMI 5? SPN 4354/FMI 5 is a diagnostic trouble code (DTC) that indicates ..