Well i failed NoX in aircare i really need some help here i got a 96 dodge ram 1500 4x4 5.2l i know its not the oxygen sensors because i my computer hooked up and the o2 sensors were working propurly i know its not my airfilter got a new one, but they say it should still pass aircare even with a bad cat so wat else could it be?

 

NOX failure is due to higher than normal combustion temps.