DPF Faults - Help

[Azcotrucking]

Hello,
I have a couple of fault codes that I can’t figure out. Doesn’t seem like sensor issues, seems more like a power issue or ground, or a fuse. I have been told there is a fuse for the DPF that is somewhere in-line around the DEF tank but I cannot find anything.

This is a 2014 International Prostar with ISX 15.

Fault Codes
• 1881 – DPF Differential Pressure Sensor: data valid but below normal range
• 3133 – Intake NOx Sensor: data erratic, intermittent, or incorrect
• 3134 – Outlet NOx Sensor: data erratic, intermittent, or incorrect
• 4151 – SCR Catalyst Efficiency: below normal operating range

Anything you all can think of? Thank you

[hookliftpete]

Looks like an egr cleanup is in order as well as likely the various sensors replaced, they do go bad after a while from the soot.

[Rawze]

just some thoughts ...
you might also want to inspect the main harness as it heads towards the engine and across the frame, etc. - The faults seem a bit random and possibly unrelated unless considering a wiring issue in the main harness going back to the engine.