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did you try swapping your nox sensor locations? I cant help but think your only possible remaining issue is that the detection into the SCR is low, or that the detection out is high. I realize you already swapped for new sensors, but you wouldnt be the first to get a bad part from production.
You would get some NOx conversion in the DOC but still I would think that doesnt have anything to do with it since 4d16 claims to be a measure of SCR efficiency, meaning does it meet the expected NOx reduction, not whether it achieves a total NOx number.
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