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Oxygen sensor problem

Discussion in 'Gen 2 Prius Technical Discussion' started by Giorgi Avalishvili, Nov 23, 2024 at 1:35 AM.

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  1. Giorgi Avalishvili

    Giorgi Avalishvili New Member

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    Hello guys.
    I have downstream oxygen sersor problem changed the sensor deleted all codes (p0136 p0137 p0138 p0139) and removed check light.
    After driving 50miles check light come back and now it showing p0136 and p0137 codes but the oxygen sensor is brand new.
    What can be problem? There is something i cant see?
     
    #1 Giorgi Avalishvili, Nov 23, 2024 at 1:35 AM
  2. Brian1954

    Brian1954 Senior Member

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    You could have a wiring problem or a leak in the exhaust system.
     
    #2 Brian1954, Nov 23, 2024 at 9:00 AM
  3. Giorgi Avalishvili

    Giorgi Avalishvili New Member

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    I see the issues what can cause this codes but exhaust system not have leak and also wires are in good condition
     
    #3 Giorgi Avalishvili, Nov 23, 2024 at 9:07 AM
  4. mr_guy_mann

    mr_guy_mann Senior Member

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    What voltage do you see on your scantool for the downstream oxygen sensor? Check at different conditions while the engine is running.

    What brand of sensor was installed? I only use a Toyota or Denso from a reputable source.

    Posted via the PriusChat mobile app.
     
    #4 mr_guy_mann, Nov 24, 2024 at 4:24 PM
  5. EternalPrius

    EternalPrius Junior Member

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    Is the cat aftermarket or oem? I had this problem shortly after installing a cheap aftermarket cat on ebay
     
    #5 EternalPrius, Nov 24, 2024 at 7:46 PM
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