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Is my 12v battery bad?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by priusmanneedhelp, Oct 11, 2020.

  1. priusmanneedhelp

    priusmanneedhelp Junior Member

    Joined:
    Oct 11, 2020
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    Location:
    Arizona
    Vehicle:
    2005 Prius
    Model:
    ----USA----
    Hi I have a 2005 Prius and I just had a few questions.
    My keyless entry and the unlock and lock buttons on my fob do not work. I have tried the button below the steering wheel and my battery in the fob is new and good. The little red light on it turns on when I press a button.
    In maintence mode,

    ACC the volt is 11.9

    IG ON the volt is 11.4 then to 11.7 then down to 11.6

    READY the volt is 14.2 then went down to 13.8 then to 13.9

    I recently got a p0420 code which is probably unrelated but I figured I'd include it. When I plugged in my obd scanner and ran an emissions test (take a look at the image I attached)

    The prius doesn't burn oil at all.

    I've heard something about putting an extender on my oxygen sensor to remove this code. Would this work?

    Thanks in advanced Screenshot_20201011-181139.jpeg

    Posted via the PriusChat mobile app.
     
    #1 priusmanneedhelp, Oct 11, 2020
  2. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
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    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    The 12v battery seems a little low, you probably can just charge it and it'll be good again.

    You can try changing your FOB battery as well
     
    #2 JC91006, Oct 12, 2020
  3. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
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    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Get the 12 volt tested with an electronic load tester. Most battery retailers have such testers and will likely test for free. Dealerships ditto, but likely for a charge. You can DIY with something like Solar BA9.
     
    #3 Mendel Leisk, Oct 12, 2020
  4. priusmanneedhelp

    priusmanneedhelp Junior Member

    Joined:
    Oct 11, 2020
    26
    0
    0
    Location:
    Arizona
    Vehicle:
    2005 Prius
    Model:
    ----USA----
    I've tried changing the fob battery but no luck. Ill see if I can get the 12v charged.

    Posted via the PriusChat mobile app.

    Ok ill try that. Any ideas on whats wrong with my key fob?

    Posted via the PriusChat mobile app.

    I tested the battery and got around 12.49v when the car was off

    Posted via the PriusChat mobile app.
     
    #4 priusmanneedhelp, Oct 12, 2020
    Last edited by a moderator: Oct 13, 2020
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