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Investigating SPN 4364 FMI 18 on Freightliner Cascadia
Detroit Diesel defines the SPN 4364 FMI 18 code as relating to SCR NOx conversion falling below the calibrated threshold for EPA10 systems. In my Freightliner Cascadia, I’ve noticed the malfunction indicator lamp is on, and there's a 25 percent engine derate. Given these symptoms, what might be the connecting factors at play? What specific components or systems should a qualified shop check first, especially regarding air management, EGR, NOx sensors, DEF, and temperature or pressure codes?
Verified source: MC-10129699-9999 — SPN 4364 FMI 18