I am a first itme diesel owner as of July. My truck is a 2013 3500 duramax with 57,000 miles on it. Recently it pulled a NOx code. Teh diesel shop I am taking it too said new sensorts are $370 a piec...
OP, you can run an emissions intact tune which leaves everything in place, but turns off the EGR. You might have more DEF usage, but at at least you are not sending exhaust gas back into your intake.