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Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)

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16y ago

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What code is PO420?

Code PO420 is catalytic converter efficiency low bank 1


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Do didn't say which engine you have. The trouble code PO420 is telling you there is a catalystic converter not doing it's job. We need to know which engine and what year you have in order to determine which cat is at fault.


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