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International Automotive Technicians Network
Re: p0420 p0430
Posted to Technical Discussion Forum on 4/26/2023

These have 4 O2 sensors. Front one on the passenger side front is B2S1 it is for cyl.2&3 O2 on the drivers side front is to monitor 1&4. I would look at your fuel trim if its good start looking at O2 sensors to make sure they are all good. Then start graphing ... Login to read more.