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Compressor sound at rear?

Discussion in 'Prius v Main Forum' started by PriusHead05, Jan 6, 2023.

  1. PriusHead05

    PriusHead05 Member

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    I noticed this last night and now tonight. I go out to my garage, and I hear this. It's sounds like a humming/ air compressor noise (not as loud, more muffled) coming from behind the driver's side rear wheel. It's a 2012 Prius V Pkg. 3. 162k mi. Going to try to attach a video with sound. The sound also goes up in intensity about half way though. What is it? Is it something I should be worried about?
     
    #1 PriusHead05, Jan 6, 2023
  2. bisco

    bisco cookie crumbler

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    not at all. it's just an emissions system test, described in the o/m
     
    #2 bisco, Jan 6, 2023
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  3. Air_Boss

    Air_Boss Senior Member

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    Fuel pump?
     
    #3 Air_Boss, Jan 6, 2023
  4. PriusHead05

    PriusHead05 Member

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    Not when the ignition is off. The car has been sitting for about 3 hours.
     
    #4 PriusHead05, Jan 6, 2023
  5. ChapmanF

    ChapmanF Senior Member

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    Answer given by bisco in #2. A super-frequently-asked question around here. The owners' manual covers it:

    [​IMG]


    For the morbidly curious, another of the many threads where it's been discussed has a diagram of exactly what the car is doing in that test.

    [​IMG]


    You can see you might hear that pump running for as long as 22 minutes and change, depending on how long step C goes.
     
    #5 ChapmanF, Jan 6, 2023
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  6. wafwat

    wafwat Junior Member

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    This sound? :)

    Fuel pump? | PriusChat
     
    #6 wafwat, Jan 8, 2023
  7. ChapmanF

    ChapmanF Senior Member

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    Yes, probably that sound—which is (spoiler alert) not the fuel pump.
     
    #7 ChapmanF, Jan 8, 2023
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