“NoX efficiency below threshold”

I got this code today and I’m wondering how I fix it and what does it mean.

Any help would be great

 

i dont know how to fix it stock. can you take it to a dealer. i got a smarty on my truck

 

pull codes and get me the code #

 

NOx is the generic name for a group of highly reactive gases that contain varying amounts of NO and NO2.

NOx traps are composed of materials (often barium salts) that store NOx under lean conditions, and then periodically release and catalytically reduce the stored NOx to CO2 and N2 under rich conditions.

Sounds like it would have something to do with the exhaust, I'm sure that someone here has a lot more knowledge about this. Sorry couldn't be much help.

 

Thanks yall for the help, I talked to the dealer and was told it was "most likely" the catalyst filter right after the turbo but he couldn’t be sure until I brought it in. I've got 10k miles left on the warr. and after that all this junk is getting tossed!! Thanks Again