Head And Sensor1 Is The O2 Sensor Before The Converter It Is Located - the purpose of this page is not to provide plete engine repair information but rather some technical information about the engine design and information about mon repairs and service requirements answer you have to banks which are the o2 sensors so if it says to rich bank one that means your front o2 sensor is bad in my 2000 saturn sl1 this code ended up being the catalytic converter locate the oxygen sensor electrical connectors at the right side of the engine above the exhaust manifold green arrows label or mark the connectors to help during the reinstallation process bank 1 sensor 1 green arrow bank 2 sensor 1 yellow arrow bank 2 sensor is hard to see in this photo yellow arrow points to where it is it is buried beneath the ignition wiring harness my cel came on throw n the dreaded p0420 it was the cat and upstream o2 sensor which i replaced after mkt cat 8k miles later the cel came back.

on with you guessed it p0420





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