Quote:
Originally Posted by Yozh
floydarogers, next time you decide to blow almost 2k on a set of another perfectly good NOx sensors, please give me a call and I can lend you mine that are sitting in a box. Will even drive them to Everett or somewhere. Really hope you kept your old ones at least.
Why do you guys start with the difficult and expensive, where the urea tank flush along with a nozzle rinse should be the first to try. I bet your SCR is fine as well. The only thing that can affect it is contamination, and unless you are blowing soot through it, you can only have crystallized urea in it. Water dissolves the urea, btw. Urea is funny, it has a 6 mos shelf life, so past that, expect to have issues, shorter in hotter climates.
Please clean your urea nozzle and see what changes...
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The fault analysis for 4D16/DeNOx Efficiency includes checking the DEF injector *BEFORE* moving to the NOx sensors. Why do you assume it wasn't checked?
There are other codes for DEF fluid being bad; as you know that is tested for by the DDE after every Regen of the DPF.