CCM Posted July 11, 2017 Share Posted July 11, 2017 Working on a 2012 MRU613 mp7 with non-catalyzed system. I have a constant returning code of SPN 5246/FMI 0, SPN 4094/FMI 18. Replaced def doser nozzle. checked egr valve for flow while unplugged. (has slight flow) Checked diff sensor and checked ports for plugging. Not plugged. I can perform a regen and codes become inactive. Truck will return within a few days with same issue. Just replaced Nox sensors due to updated part number and road tested unit (max hill grade is 15%) while monitoring Nox readings. Nox intake always showed 0 and Nox outlet varied between 236 to 510. Anybody have an idea on what the Nox levels should be? Quote Link to comment Share on other sites More sharing options...
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