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P2195 07 Prius stalls at highways speeds

Discussion in 'Gen 2 Prius Main Forum' started by Frankusa94, Aug 24, 2024 at 9:45 AM.

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  1. Frankusa94

    Frankusa94 New Member

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    My 07 after 3-5 miles of driving at 60mph+ …will suddenly starts blowing black smoke out tail pipe, mpg drops to 15mpg, stops charging hv battery and gradually rolls to a stop as battery becomes depleted. Powering the car off for a 2 minutes allows the car to restart and run normally…I do need to wait a few minutes for hv battery to charge up… then car drives fine the rest of the trip. Throws codes p2195 “ Bank 1 sensor stuck lean” car runs fine under 60mph. Aftermarket Upstream O2 sensor is 3 months old. anyone have any thoughts on this issue?
    Thanks
    Frank
     
    #1 Frankusa94, Aug 24, 2024 at 9:45 AM
  2. bisco

    bisco cookie crumbler

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    my only thought is an ecu issue, but i have no idea really. i can't understand why turning it off an on fixes it, except for the resetting of an ecu.
     
    #2 bisco, Aug 24, 2024 at 4:30 PM
  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    What do the fuel trims look like?
     
    #3 Leadfoot J. McCoalroller, Aug 24, 2024 at 5:00 PM
  4. Brian1954

    Brian1954 Active Member

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    Reply from the other thread that you posted in. Copied here for clarity.

     
    #4 Brian1954, Aug 24, 2024 at 8:12 PM
    dolj, Leadfoot J. McCoalroller and bisco like this.
  5. Frankusa94

    Frankusa94 New Member

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    Leaning towards replacing with denso o2… just seems odd this aftermarket o2 works fine at city speeds and would only flake out after 3-5 miles of driving at 65+ mph. Another clue is the hv battery stops charging when issue occurs. I wish is knew if that happens once p2195 is set… or is it a charging issue that leads engine issue p2195?
     
    #5 Frankusa94, Aug 24, 2024 at 11:48 PM
  6. Frankusa94

    Frankusa94 New Member

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    thank you
     
    #6 Frankusa94, Aug 24, 2024 at 11:49 PM
  7. Frankusa94

    Frankusa94 New Member

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    I am just as puzzled… clear thing is that it only… only happens at 65+mph speeds…
     
    #7 Frankusa94, Aug 24, 2024 at 11:52 PM
  8. Frankusa94

    Frankusa94 New Member

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    Short term trim is 0%
    Long term is usually 12-13%

    thanks
     
    #8 Frankusa94, Aug 24, 2024 at 11:55 PM
  9. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    That's a very big trim. Combined with the error code I'm inclined to think that you've got a bad sensor or possibly a major air leak downstream from the MAF.
     
    #9 Leadfoot J. McCoalroller, Aug 25, 2024 at 5:17 AM
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