Any reason to replace my MAP sensor?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by mhdriver, Feb 21, 2026 at 11:51 AM.

  1. mhdriver

    mhdriver Member

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    205k miles, not getting a code from it. Mileage is 49 mpg. I bought one from Amazon for about $24. I can either return it or toss it on, Which should I do?
     
    #1 mhdriver, Feb 21, 2026 at 11:51 AM
  2. VelvetFoot

    VelvetFoot Active Member

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    wrong forum
     
    #2 VelvetFoot, Feb 21, 2026 at 12:13 PM
  3. mhdriver

    mhdriver Member

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    Definitely! My mistake. Thanks.
     
    #3 mhdriver, Feb 21, 2026 at 12:20 PM
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  4. BiomedO1

    BiomedO1 Senior Member

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    IMHO; if it ain't broke - DON'T screw with it. Attached is an example of replacing stuff that's working fine. Especially if your going to install a non-OEM and possible counterfeit part in place of an OEM part. MAP sensors don't really wear-out; unless you've removed the air filter and it's constantly getting pelted by debris. Just change your air filter every 30K miles.
     
    #4 BiomedO1, Feb 21, 2026 at 12:28 PM
    Last edited: Feb 21, 2026 at 12:55 PM
  5. Mendel Leisk

    Mendel Leisk MMX GEN III

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    I think there'd be a code if there was any problem with the current MAP (Manifold Absolute Pressure) sensor. It doe sit in a bit of a cesspool though. I'd leave it be.

    ^ Looked up the part nunmber using Google AI, got this:

    89421-47010

    $24 USD on Amazon, sounds a bit sketchy...

    Couple of reputable links:

    Buy Genuine Toyota 8942147010 (89421-47010) Sensor Assy, Vacuum. Prices, fast shipping, photos, weight - Amayama

    Vacuum Sensor #89421-47010 | Autoparts.toyota.com
     
    #5 Mendel Leisk, Feb 21, 2026 at 1:00 PM
  6. mhdriver

    mhdriver Member

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    Yeah. I'm just going to get MAF sensor cleaner and clean them both. That is the MAF
     
    #6 mhdriver, Feb 21, 2026 at 1:07 PM
  7. Brian1954

    Brian1954 Senior Member

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    FYI, I have reported this to the moderator and asked it to be moved to the Gen 3 forum.
     
    #7 Brian1954, Feb 21, 2026 at 2:49 PM
  8. mhdriver

    mhdriver Member

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    Good idea :).
     
    #8 mhdriver, Feb 21, 2026 at 4:10 PM
  9. Tideland Prius

    Tideland Prius Moderator of the North
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    *moved*
     
    #9 Tideland Prius, Feb 21, 2026 at 5:31 PM
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  10. PriusCamper

    PriusCamper Senior Member

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    Do both!
     
    #10 PriusCamper, Feb 21, 2026 at 8:36 PM
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