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If the cat that the PO installed is not a 3-way unit, then it isn't processing your NOx emissions. 9 times out of 10 a NOx SMOG failure is from a dead or incorrect cat.
If the cat that the PO installed is not a 3-way unit, then it isn't processing your NOx emissions. 9 times out of 10 a NOx SMOG failure is from a dead or incorrect cat.
what's a 3 way unit, and how does it differ from other types?
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