2 SPN 4364/FMI 1 - EPA10 Selective Catalyst Reduction NOx Conversion Very Low Table 1. SPN 4364/FMI 1 Description This fault code sets when the Aftertreatment Control Module (ACM) detects that the NOx conversion is lower than a calibrated threshold Monitored Parameter Selective Catalyst Reduction (SCR) Inlet NOx sensor, SCR outlet NOx sensor
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