DD15 low NOx conversion efficiency and bad DEF Quality

That really sucks. Search the forums or YouTube for"nox outlet sensor breath fresh air"

 

I will thank you boss.

 

I forget to mention I did replace outlet and inlet sensor as well and codes comeback. The shop said I need new SCR One Box.

 

Yes you need it. But do you really want to spend 15k on that truck ?

 

You can take the Nox outlet sensor out of the exhaust and let it breath fresh air . You can follow the wire attached to the outlet sensor up to a box You would need to tuck the sensor inside that box to keep it dry . You can delete the codes with a OTR Reset Tool
This will save you 15000$
It will still throw a code for an illogical nox output but wont derate

 

Hope you saved the old outlet sensor. You'll need an extra one to do the bypass. Here's a video on how to do it:
Freightliner Cascadia DD13 DD15 SCR filter bypass

 

The M20 metric bolt will go into that hole.

 

Thank you

 

So what was the outcome? Did you just pull the sensor or did you buy a one box?