P0420 means the ECM has detected catalyst efficiency below its threshold on Bank 1. A worn catalytic converter is common, but an exhaust leak, sensor fault, or engine problem can trigger it too. Check ...

A cleaner cannot repair a melted, cracked, or physically restricted catalytic converter. P0420 or P0430 does not prove the converter is clogged, so diagnose the engine, sensors, and exhaust before ...

This article was researched using 12 sources. See our methodology and corrections policy. Catalytic converter replacement costs approximately $2,280 to $2,480 on average in the United States, ...

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