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O2 sensor faulty

Discussion in 'Gen 2 Prius Main Forum' started by moha777, Jun 1, 2020.

  1. moha777

    moha777 Junior Member

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    Hi everyone,
    In my prius 2008 in 190k I have changed 02 sensor both not genuine and again one genuine but lights keep coming.i am much obliged if any one experience the same can advice me.BELOW IS THE DIAGNOSTIC PICTURES TIA. Screenshot_20200529-175341_Drive.jpeg

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    #1 moha777, Jun 1, 2020
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    Here is the workup for DTC P0031 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip0031.pdf

    Here is the workup for DTC P0037 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip0037.pdf

    Here is the workup for DTC P2239 and P2252 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip2238.pdf

    You may need to upgrade you tools to include a 'mini-vci' cable and techstream, which requires a windows device that has a USB port.
     
    #2 SFO, Jun 1, 2020
    moha777 and Raytheeagle like this.
  3. moha777

    moha777 Junior Member

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    Hi thanks for the info.apologies my technical knowledge is low.would u think if air flow sensor need checked and replaced.or fuses need checked and replaced.or 12v battery checked replaced.thanks

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    #3 moha777, Jun 2, 2020
  4. SFO

    SFO Senior Member

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    The workups in the factory manual are designed to be followed step by step.

    I would start with step #1 in each workup (p0031 and p0037), and measure the resistance for both aftermarket sensors as that could be the problem. Which brand and part# did you replace them with, most would recommend using Denso or toyota OEM sensors only.

    If the vehicle starts, the 12v battery should be fine for the time being.
     
    #4 SFO, Jun 2, 2020
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