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Is Bank 1 referring to the upstream or downstream sensor?

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1999 Toyota 4Runner 6 Cyl, is Bank 1 referring to the upstream or downstream sensor?

Vehicle: 1999 Toyota 4Runner 6 Cyl

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P0420 is the front catalytic converter for the left side where cylinder 1 is. upstream or downstream  is talking about the O2 sensor the problem is the catalytic converter

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