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
That problem is usually caused by a loose or bad gas cap.. if the light came on right after filling your gas tank then it could be just a loose cap..
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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