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Guarantee pass is bs. Fix the real problems, I had the same high nox problem with mine a few years ago.
Order of most effective :
1 buy brand new magnaflow cat
2 timing must be on point
3 fresh 02 sensor
4 clean out egr
5 put some denatured alcohol in gas tank
6 run car hard before smog and do not turn vehicle off
Good luck dude.
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