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Q: I am getting the code PO420 Catalyst efficency low bank on 2008 Chevrolet Aveo

What is the likelyhood that the catalytic converter has indeed failed or could I get that same code if it were just a sensor gone bad?
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this is an obd2 trouble code table, it can help you understand the meaning of code.
http://chinasinoy.com/upload/service/diagnostic-trouble-code-table-02.pdf
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