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"SPN 4364 FMI 18 is an engine error code that can cause a lot of confusion and concern for drivers and fleet operators. This code is related to the after-treatment system of the engine and can indicate a variety of issues, ranging from a faulty NOx sensor to a malfunctioning DEF system. In this article, we’ll explore the causes and symptoms of SPN 4364 FMI 18 and discuss some potential solutions."
I wonder if it's no different than my 6.7 Cummins and I had to replace the NOX sensor. Not cheap, I think it was about $600 with labor. Our government at work with overbearing emissions regulations.