The internet is a good place to look up the PO420 code. This is a DTC trouble code that is related to OBD-II vehicles. You can use the internet to find articles about this code and what it does.
Q&A Related to "Po420?"
Code PO420 is catalytic converter efficiency low bank 1, sensor1. You did not state as to the year,make and model of the car as well as the engine size. I am a member of IATN and
P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)\ This means that your bank 1 catalytic converter is not doing its job, or the O2 sensor system monitoring it
P0420 makes me crazy. It is "catalyst system efficiency below threshold [bank 1] but I have never known it to be caused by a bad catalytic converter. If you take it to the dealer
P0420 means "Catalyst System Efficiency Below Threshold (Bank
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