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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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What mean P0420?
Trouble code P0420 means: Catalyst Efficiency Below Normal (Bank 1)
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Trouble code P0420 means: Catalyst System Efficiency Below Threshold (Bank 1)
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Trouble code P0420 means: Catalyst System Efficiency Below Threshold (Bank 1)
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Trouble code P0420 means: Catalyst Efficiency Below Normal (Bank 1)
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Trouble code P0420 means: Catalyst Efficiency Below Threshold (Bank 1)
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P0420 Catalyst System Efficiency Below Threshold (Bank 1)
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Trouble code P0420 means: Catalyst Efficiency Below Normal (Bank 1)
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Trouble code P0420 means: Catalyst Efficiency Below Threshold (Bank 1)
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Trouble code P0420 means: Catalyst System Efficiency Below Threshold (Bank 1)
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Trouble code P0420 means: Catalyst Efficiency Below Threshold (Bank 1)
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Trouble code P0420 means: Catalyst system efficiency below threshold (bank 1)
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Trouble code P0420 means: Catalyst Efficiency Below Normal (Bank 1)
