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ok so look at ur o2 sensors n see if there communicating with ur cat
ur pre cat o2 should read up and down between .2 -.7 and ur after cat o2 should be very steady at .5 -.7
if this turns out good then look at ur egr
ur egr doesnt fail often its usually plugged up in the pipe
also check ur bank one and bank 2 short term and long term fuel trim
if its a cat or o2 then ur nox should be off but the rest of the reading should be bang on
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