diagnostic code P0420 catalyst system below threshold.
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diagnostic code P0420 catalyst system below threshold.
First i changed rear catalytic converter, next problem IAC valve. next problem I get scan code P0420 stating Catylist system below threshold Bank 1. Now do i change upstream heated o2 sensor downstream o2 sensor or do i have to replace Y catalytic converter now . PLease help.
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dominicc926
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Apr 3, 2013 04:50 AM
jcasaccio
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Nov 2, 2009 06:24 AM
