2021 MX13 pac car dpf and scr efficiency issues in need of egr tuneup

[RollinCoal]

You can clean the doser but the issue is its not dosing enough def, when they get worn they tend to cut the cycle a bit short as they also "meter" the amount of def when this happens you tend to get SCR efficiency code monitor inlet and outlet nox you need a min of 70% conversion. Cummins with all working as it should will do 80-90% DD engines Ive seen 100% mostly 90+%

[mikkhh]

Inside of the hole where doser is spraying has got white crust buildup. Will that buildup go away after forced regen or needs to be cleaned?

This truck is having issues with def level/quality sensor now. Will try to pull that sensor from tank.

[Rawze]

(06-13-2025 )mikkhh Wrote:  Inside of the hole where doser is spraying has got white crust buildup. Will that buildup go away after forced regen or needs to be cleaned?

This truck is having issues with def level/quality sensor now. Will try to pull that sensor from tank.

it will not clean itself. you need to clean it good with a wire brush.