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My check engine light came on and my mechanic said the Catalytic Converter was the problem. How can I be sure?

April 26, 2017came Catalytic converter engine light mechanic problem said sure

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My check engine light came on and my mechanic said the Catalytic Converter was the problem. How can I be sure?

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This has been a tricky problem for most mechanics and exhaust shops, When diagnosing the problem with a scan tool. The code that comes up for an inefficient Catalytic Converter is a PO420.