Downstream O2 Sensor Replace

Discussion in 'Gen 3 Prius Main Forum' started by itengineer, Dec 2, 2022.

  1. itengineer

    itengineer Member

    Joined:
    Oct 23, 2011
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    Location:
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    Vehicle:
    2011 Prius
    Model:
    Two
    Does anyone have instructions on how to replace the downstream O2 sensor?
    This is the one after the cat.
    TIA
     
    #1 itengineer, Dec 2, 2022
  2. itengineer

    itengineer Member

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    Location:
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    Vehicle:
    2011 Prius
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    Two
    FYI - I bought a 2 day subscription to TSI
    I was able to download the diagnostic/install PDFs
     
    #2 itengineer, Dec 2, 2022
  3. PriusCamper

    PriusCamper Senior Member

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    It's easy... There's youtube videos on it too... The plug is under the carpet close to to dash on left side of front passenger seat. I think I usually use a big 7/8" box wrench and count the number of turns so I can pre twist the new cable/wires so once it's screwed in the wires are no longer twisted but straight.
     
    #3 PriusCamper, Dec 3, 2022
    itengineer likes this.
  4. itengineer

    itengineer Member

    Joined:
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    Location:
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    Vehicle:
    2011 Prius
    Model:
    Two
    Thanks. I did find this specifically for the 2011
    However I ended up paying a mobile mechanic $100 to install the new sensor

     
    #4 itengineer, Dec 11, 2022
  5. Kam2

    Kam2 Junior Member

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    Anyone knows the part number for OEM ?
     
    #5 Kam2, Jan 19, 2024
  6. Mr. F

    Mr. F Active Member

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    8946547080

    Denso also sells it as the 234-4400, which you can likely obtain for much less.
     
    #6 Mr. F, Jan 19, 2024
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