p0420 cat code – need to replace bank 1 or replace o2 sensor?

New Topics Forums General Discussion 2004 – 2009 Nissan Quest p0420 cat code – need to replace bank 1 or replace o2 sensor?

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    questfan07
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    getting a p0420 error for my bank 1 cat on my 07 quest..
    question is do i replace the bank 1 cat?? or try to replace the o2 sensor that goes to the cat?

    also looking to spend the lowest amount to fix this error code – if this is just a simple bolt off then bolt on replacement i can handle it

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