Vehicles

SPN 4364 FMI 18 DTC Explained, Troubleshooting

SPN 4364 is a diagnostic trouble code for Aftertreatment 1 SCR Catalyst Outlet Gas.

FMI 18 – Scr Nox Conversion Efficiency Low

Troubleshoot
ACM – aftertreatment control module
EGR system, turbo, DEF injector, Doser pump

 

 

An SPN code is a suspect parameter number. It is a diagnostic fault code. A FMI is a failure mode identifier that gives more details about error.

Examples: