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What does catalyst efficiency below threshold Bank 1 mean?

Anonymous

∙ 14y ago

Updated: 10/20/2022

The catalytic converter for bank one is not working properly. Either a exhaust leak, a failed O2 sensor, or a failed cat.

Wiki User

∙ 14y ago

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Code P0420 means "Catalyst System Efficency Below Threshold (Bank 1)" P0420 is actually Catalyst System Efficiency Below ThresholdCatalyst System Efficiency Below Threshold. Bank 1 is the side of the engine with cylinder #1. This code means that the catalytic converter is not cleaning the exhaust properly or the oxygen sensors are sending false info to the computer.

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