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P102D - Check engine on 2011

Discussion in 'Gen 3 Prius Main Forum' started by itengineer, Nov 28, 2022.

  1. itengineer

    itengineer Member

    Joined:
    Oct 23, 2011
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    Location:
    Minneapolis
    Vehicle:
    2011 Prius
    Model:
    Two
    Hi All,

    Your advice needed on this issue


    20221128_124458.jpg 20221128_124454.jpg
     
    #1 itengineer, Nov 28, 2022
  2. ChapmanF

    ChapmanF Senior Member

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    Mar 30, 2008
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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    P102D is a weird code, reporting a higher-than-expected current flowing through the heater circuit during the OFF portion of the control pulse. (That's what makes it weird.)

    It shares the same troubleshooting steps with the other O₂ sensor heater codes, so you could check the resistance of the heater, the wiring continuity and so on. But the business of current flowing when the power transistor ought to be OFF might be harder to find a cause for outside the ECM itself.
     
    #2 ChapmanF, Nov 28, 2022
    Mr. F likes this.
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