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  1. K

    O2 sensors in pairs?

    Bank 1 sensor 2 is driver side post cat but i would recommended checking what was listed in last post first
  2. K

    O2 sensors in pairs?

    Po137 is typically a lean on bank 1 code. B4 attacking sensors i would check for vac.leaks around intake, failing fuel pump, or clogged fuel filter.

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