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Hy guys I need a help with this problem
My nox sensor I (before SCR) show up to 400ppm and nox II (after SCR) up to 900ppm that makes no sense to me... Pls help it shows adblue system failure on display
 

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I'm not an expert but it sounds like you have to fix your scr. It sounds like you have buildup that is not getting burned off. I have seen some videos where they clean the scr through a hole in the scr but have never done it myself.

If you have to do an expensive repair, you might consider a full delete instead.
 
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