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Hello all. I got a p420 code which is coming up either the O2 sensor or the cat. It was erased than 1 week later it came back .. The exhaust was done less than 6 months ago on my 2005 rav 4 so I am guessing it's the o2 sensor. My local AutoZone said it is Bank 1 but can not tell me up stream or downstream. Any suggestions on which ? Looking to do myself to save some $$. Thanks a lot
 

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I guess you could take both O2 sensors and perform a resistance test. There are some videos in youtube on how to do it then if they failed or doesnt meet the criteria by O2 vendor there will be a need for a new one....you see I got p420 & p430 in back 1 and 2 and I'm going to test all O2 sensors before replacing the catalytic converter (it is too expensive). I'll bring my conclusions once done.

Ed.
 
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