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P0420=Catalyst System efficiency below threshold
the po420 could also be a misfire or vacuum leak
Po420 2001chevy lmpala
Code PO420 is catalytic converter efficiency low bank 1
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.
What is a PO420 in a 2002 mercury cougar: Now if your car is 2.0L DOHC. OBD ll PO420 : Catalyst Efficiency Below Threshold (BANK 1). Hope this helps...
P0420 is a Catalytic Converter efficiency failer. More than likely you will need a new Catalytic Converter.
Catalyst efficiency below threshold. (The catalytic converter may be failing.)
look it up on yahoo as engine codes cylinder 2 misfire it happened on mine the other day. 98 2.7 litre 4x4
catalyst system fault
You need to obtain a troubleshooting chart for that code. If I recall, it has to do with the Evaporative system.
Depends what you mean by codes. Do you mean Cryptology or "Passwords".