catalyst system fault
Code PO420 is catalytic converter efficiency low bank 1
It's Catalyst system efficiency below threshold
pull the intake and fix the secondary runners
Catalyst efficiency below threshold. (The catalytic converter may be failing.)
I clear the check engine light with a Scangauge II. But most ODB-II devices can read and clear the code.
Trouble code P0420 means:Catalyst system efficiency below threshold
PO420 is catalystis efficency low bank 1. That is referring to the catalytic convertor bank 1.
You need to obtain a troubleshooting chart for that code. If I recall, it has to do with the Evaporative system.
P0420 = Catalyst Efficiency Below Threshold (Bank1). Sounds like you probably need to replace the Bank 1 (drivers side) Catalytic converter.
Ckp sencer
Code PO420 is catalyst effeciency low bank 1 sensor 1 which is referring to the oxygen sensors. Have a repair shop do the diagnostics on the system. Jumping to conclusions can become very expensive.
Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)