Bank 1 o2 sensor replacement?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by eatdrumss, Mar 10, 2022.

  1. eatdrumss

    eatdrumss Junior Member

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    Is it okay to just replace bank 1 that is throwing a code or should I really consider replacing both banks at the same time?

    Also are they both the same part?
     
  2. PriusCamper

    PriusCamper Senior Member

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    Maybe clean and inspect both of them first and then when code comes up again decide?
     
  3. eatdrumss

    eatdrumss Junior Member

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    I could replace bank 1 and then clean the old one for later use? ....[as needed]

    How would I clean it off?
     
  4. JC91006

    JC91006 Senior Member

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    The downstream 02 sensor would be the one causing the code. It's fairly cheap for the OEM Denso on Amazon, less than $50.

    But most of the time, the code is caused by a bad Catalytic converter
     
  5. eatdrumss

    eatdrumss Junior Member

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    Code says bank 1 upstream...p2196....also others have had the same issue after replacing an engine.

    Is it correct there are 2 upstream sensors and 1 downstream on the 2010s..?
     
  6. PriusCamper

    PriusCamper Senior Member

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    I'm way more willing to believe someone's claim of a faulty upstream sensor compared to someone's claims of a faulty downstream sensor.
     
  7. PriusCamper

    PriusCamper Senior Member

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    I'm way more willing to believe a faulty upstream sensor compared to someone a faulty downstream sensor.
     
  8. PriusCamper

    PriusCamper Senior Member

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    I'm way more willing to believe a faulty upstream sensor compared to someone a faulty downstream sensor.
     
  9. PriusCamper

    PriusCamper Senior Member

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    I'm way more willing to believe a faulty upstream sensor compared to someone a faulty downstream sensor.
     
  10. JSB_99

    JSB_99 Member

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    don't be surprised if changing one or both don't fix the problem.
    There is only one up and one down.
     
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