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What is your question?
how you know when your catalyast converter bad?
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It will set a trouble code P0420, it will no longer neutralize hydro carbons, CO, and NOx emissions. Before condemning the cat a professional grade scan tool should be used to look at fuel trim figures, O2 sensor values and make sure there are no other problems that are can cause the new cat to go bad or are the faults to begin with.