DD15 aftertreatment issues
Im having some issues with aftertreatment on a DD13 (2016 western star cement mixer)
Relavent codes are scr efficiency low, scr efficiency very low, and def quality low.
Changed def filter, Ran regen, no luck. Nox output high around 250 after 15 min in a regen. Scr conversion efficiency around 40%.
Originally doser quantity test was below 100 ml, replaced and we're at 125ml. This made no change to the conversion efficiency.
Threw a outlet nox sensor at it as this unit will not allow me to do a NOx verification test. Still no luck.
Scr efficiency test passes, as well as the troubleshooting tree for low def quality passes.
I will attach pictures of what im seeing on Diagnostic Link during regen, any input would be greatly appreciated. Im kind of leaning towards a failed SCR but would like some input from someone who may have dealt with this.