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Help trouble shooting P0138

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by dorihachigo, Jan 21, 2019.

  1. dorihachigo

    dorihachigo Junior Member

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    2005 Prius
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    II
    Hello, I had a cel pop up and scanned it for P0138: o2 sensor circuit bank 1, sensor 2. I quickly got a new post-cat o2 sensor, (Denso) installed it and reset the code. After a few miles of driving, P0138 came out. I reset the cel and it will still pop out after a few miles.

    What do you guys think might it be? I am thinking I'd replace the pre-cat o2 sensor, but wouldn't that show a different cel code? (or is P0138 for the two sensors). Thank you.
     
    #1 dorihachigo, Jan 21, 2019
  2. Jmack111

    Jmack111 Member

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    Could drop the cat and try cleaning the screen with a brush mostly clogged screen easy way to cut after the cat and use a coupler or reweld it

    Posted via the PriusChat mobile app.
     
    #2 Jmack111, Jan 21, 2019
  3. SFO

    SFO Senior Member

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    #3 SFO, Jan 22, 2019
  4. Jmack111

    Jmack111 Member

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    I used aftermarket cat 100. Off eBay and OEM sensors but it look like the screen was just clogged when I took it apart but I already ordered the cat

    Posted via the PriusChat mobile app.
     
    #4 Jmack111, Jan 22, 2019
  5. dorihachigo

    dorihachigo Junior Member

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    2005 Prius
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    II
    SFO, it is Denso 234-4623. Thank you for the Toyota FSM page
     
    #5 dorihachigo, Jan 23, 2019
    SFO likes this.
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