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Emissions Trouble

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Having a hell of a time getting my emissions to pass inspection.


First time I took it in, failed. Realized the PO took the dam the cat off. Okay so I take it in and get a cat installed.


Took it in today, hydrocarbons are good, but Nox is way high. Actually 4 times higher than pre cat, which really doesnt make sense.



Assuming the guy didnt screw up the second time and I do in fact need to get Nox down, where should I start?



Thanks guys

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