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Can you help me fix engine noise? Video Inside.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Roll Eyes, Dec 6, 2022.

  1. Roll Eyes

    Roll Eyes Junior Member

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    Hello forum members:

    My 2005 Prius was parked on the street and sat idle for about 5 months (since July, 2022). I have been driving another car of mine since. Before I made the Prius sit idle for 5 months, there was no noise coming from the engine compartment. It was all good. Today, when I started the Prius, there was some loud noise coming from the engine compartment. I couldn't figure out. I have uploaded the video of engine noise to this thread. If you know or have an idea or can make a guess what this engine noise is, please let me know the reason for the engine noise and how I can reduce and/or eliminate the engine noise.



    Video link ^^^.

    Thank you in advance for your time and any suggestions and advice that you could provide to me to reduce and/or eliminate the engine noise.
     
    #1 Roll Eyes, Dec 6, 2022
  2. SFO

    SFO Senior Member

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    Didn't watch the video, but will guess that one of your illustrious neighbors borrowed your catalytic converter.
     
    #2 SFO, Dec 6, 2022
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  3. Roll Eyes

    Roll Eyes Junior Member

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    Thank you for your reply.

    That was my first fear and I looked under the car, and I thought my catalytic converter is still there. I could be wrong, as I am not sure. Attached are the pictures. If I need to jack up my Prius and need to look further thoroughly for the catalytic converter, I will do that. If you want me to jack up my Prius and post further pictures, please let me know. Thank you in advance again.

    IMG_20221206_233847.jpg IMG_20221206_233931.jpg IMG_20221206_233915.jpg
     
    #3 Roll Eyes, Dec 6, 2022
  4. douglasjre

    douglasjre Senior Member

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    Push down on the top of the air box. That sound is usually an air leak because the snaps have been abused when people change air filters with aftermarket junk that is thinner
     
    #4 douglasjre, Dec 7, 2022
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  5. Roll Eyes

    Roll Eyes Junior Member

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    IMG_20221207_004954.jpg
    Thank you for your reply. Are you referring to the black rectangular plastic thing in the middle? I did push down the black cover on top of that thing, and the noise did not go away. How hard do I need to push down?
     

    Attached Files:

    #5 Roll Eyes, Dec 7, 2022
  6. douglasjre

    douglasjre Senior Member

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    If you can't troubleshoot this one you're going to have to bring it to a mechanic
     
    #6 douglasjre, Dec 7, 2022
  7. Tombukt2

    Tombukt2 Senior Member

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    And your pictures I cannot tell if the converter is gone If you just reach your hand under there with the camera and your finger on the shutter button and aim your camera up into the forward hole so you want to be arm stuck under the car at about mid-door level and then the camera lens pointing up 20° towards the front of the car that'll show the pipe and the converter if it's there that would make sense for a loud noise like you're talking a loud noise like a loud exhaust pipe correct like what the kid down the street has attached to his mustang or not attached to is the case may be or are you talking aloud engine rattling everything else sounding normal just like a bunch of nuts and bolts bouncing around in the valve cover quite a different noise
     
    #7 Tombukt2, Dec 7, 2022
  8. SFO

    SFO Senior Member

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    The first two images show the long 'resonator', just to the right of that is a catalytic, then another goes up at an angle towards the engine bay.

    If it sounds like a harley, then the catalytic is gone. Do you have warning lights being displayed on the dash, or OBD2 codes worth posting?
     
    #8 SFO, Dec 7, 2022
    ScottHz and Roll Eyes like this.
  9. ChapmanF

    ChapmanF Senior Member

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    Out of curiosity, what are the blue thingies?
     
    #9 ChapmanF, Dec 7, 2022
  10. SFO

    SFO Senior Member

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    HF flash lights (has spot, flood, hook, magnet), use to be available for free with a coupon.
     
    #10 SFO, Dec 7, 2022
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  11. Roll Eyes

    Roll Eyes Junior Member

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    Will look for or try to get the pictures of catalytic converter later when I find time.

    Went to Autozone and got the codes.
    P0037 - Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)
    C1241 - Low battery positive voltage or abnormally high battery positive voltage.     However, it says "good battery" when the battery test is done with a battery tester device. See attached picture.

    Also, there is a check engine light on the dash.

    IMG_20221207_125436.jpg

    144 Lumen Ultra-Bright Portable LED Worklight/Flashlight
     
    #11 Roll Eyes, Dec 7, 2022
  12. douglasjre

    douglasjre Senior Member

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    AutoZone's battery tested devices likely inadequate. It's probably one of those cheap little gizmos that test internal resistance of the battery. Only a load test can be relied upon
     
    #12 douglasjre, Jul 30, 2023
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