Po420?

Answer

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.
Reference:
Q&A Related to "Po420?"
Code PO420 is catalytic converter efficiency low bank 1.
http://wiki.answers.com/Q/What_code_is_PO420
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
http://www.fixya.com/cars/t9168127-code_po420
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
http://answers.yahoo.com/question/index?qid=201402...
P0420 means "Catalyst System Efficiency Below Threshold (Bank
http://www.chacha.com/question/what-does-the-error...
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