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SPN 4094 FMI 1


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I've got the dreaded 4094 fmi 1 code. Checked def pump pressure, quality and quantity of fluid. Removed def nozzle to checked spray and measured fluid. Did find several boost leaks that i repaired. Performed scr crystal sublimation test and then a regular regen test and the code is still active. During regens the inlet nox sensor never changed and always read 0 and the outlet nox sensor read correctly. Checked both NOx sensors and are the latest part numbers. Checked ecm and acm software and is up to date. Took unit on road test while monitoring and inlet nox sensor still never read off of 0. Any thoughts?

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