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2004 Prius different codes for every MIL

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Hanky_Bannister, Jun 23, 2017.

  1. Hanky_Bannister

    Hanky_Bannister New Member

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    Location:
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    Vehicle:
    2004 Prius
    Model:
    Two
    Hello everyone. I have a 2004 Prius with 208k miles. All services are current. However, I have a check engine light that pops on every day. When the codes are pulled it shows a different code every single time. The only code that stays the same is for the windshield wiper motor (it works fine). I'm stumped. Have any of you experienced this ? It's due for emissions testing (California) and I can't get current registration until this is sorted. Any help will be greatly appreciated.
     
    #1 Hanky_Bannister, Jun 23, 2017
  2. JC91006

    JC91006 Senior Member

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    Location:
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    Vehicle:
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    II
    #1 check your gas cap
    #2 check the catalytic converter (most likely failure)
    #3 3 way coolant valve
     
    #2 JC91006, Jun 23, 2017
    Last edited: Jun 23, 2017
  3. bisco

    bisco cookie crumbler

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    is toyota reading the codes?
     
    #3 bisco, Jun 23, 2017
  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    1. There is no fault code associated with the wiper motor.
    2. Exactly what DTC are being logged?
    3. What device is used to retrieve the codes?
     
    #4 Patrick Wong, Jun 23, 2017
    valde3 likes this.
  5. Hanky_Bannister

    Hanky_Bannister New Member

    Joined:
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    Location:
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    Vehicle:
    2004 Prius
    Model:
    Two
    Sorry it's been so long I've had an injury at work and am getting back up and around. One of the codes was an 1121 for the coolant switch ? The other was a very odd code for a windshield wiper motor and the other was a misfire on cylinder #3 but the car runs and operates perfect. The only thing I can see causing issue is a low 12v battery ?
     
    #5 Hanky_Bannister, Dec 5, 2017
  6. bisco

    bisco cookie crumbler

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    Plug-in Base
    sorry to hear about your accident, glad you are better!
    what code reader are you using?
    easy to check the 12v. how old is it?
     
    #6 bisco, Dec 5, 2017
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