Key Fob Security

Discussion in 'Gen 5 Prius Main Forum' started by Hans Unrat, Nov 18, 2025 at 8:32 PM.

  1. Hans Unrat

    Hans Unrat Junior Member

    Joined:
    Jan 4, 2013
    30
    11
    0
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I ran across an advertisement for a Faraday bag (which is insulated to stop thieves from copying your fob signal)- after a short web search I discovered that one can de-activate Toyota and Lexus fobs by pressing and holding the lock button while twice pressing the unlock button on the fob. To re-activate, simply press the unlock button to enter the car (when locked, the door will not open by grabbing the handle). Of course, this may be mentioned in the owner’s manual as well, this is for those who haven’t read the whole thing like me.
     
    bisco likes this.
  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    27,453
    18,053
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Cool!

    Doesn't seem to do anything with my 2010 Gen 3 though.
     
    PriusCamper likes this.
  3. Templeton

    Templeton Member

    Joined:
    Jun 26, 2024
    270
    81
    1
    Location:
    usa
    Vehicle:
    2024 Prius Prime
    Model:
    SE
    We use a little faraday box (countless varieties of them sold on amazon), that is far easier to open and close than a bag. And that's where the fob always sits when our gen5 is in the driveway. Because deactivating the fob with button pushes after every car trip would be a huge pain, or so l would think.
     
  4. otatrant

    otatrant Active Member

    Joined:
    Sep 5, 2023
    317
    194
    10
    Location:
    San Francisco
    Vehicle:
    2023 Prius Prime
    Model:
    XSE Premium
    I bought these a while back. Keep my keys in them when I am not using them. Don't think those type of attacks are very common where I live but only $13 and pretty easy to use.
    amazon
     
  5. RRxing

    RRxing Senior Member

    Joined:
    Jul 7, 2009
    2,544
    1,819
    0
    Location:
    NEPA
    Vehicle:
    Other Hybrid
    Model:
    Limited
    Try it, you'll like it! ;)

    Much less of a pain than putting the fob in a faraday cage/box every time.
     
  6. VelvetFoot

    VelvetFoot Active Member

    Joined:
    Sep 17, 2025
    500
    158
    0
    Location:
    New York State
    Vehicle:
    2026 Prius
    Model:
    LE
    Page 133 of the 2026 manual:
    upload_2025-11-19_8-30-6.png
     
    Hans Unrat likes this.
  7. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    27,453
    18,053
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    I walk in the door, keys go into an old tin someone gave me cookies in.

    I confirmed its sufficient Faraday-ness by walking it right out to the car with the fob inside and trying to get in.
     
  8. Doug McC

    Doug McC Senior Member

    Joined:
    Feb 15, 2022
    1,079
    415
    0
    Location:
    Midwest
    Vehicle:
    2022 Prius
    Model:
    XLE
    We’ve been doing that since we bought our ‘22 new and still haven’t had to change the batteries. Easier for us than having to stop and put them in a separate container all the time and the fob that isn’t in use when we travel is still asleep.
     
  9. Hans Unrat

    Hans Unrat Junior Member

    Joined:
    Jan 4, 2013
    30
    11
    0
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I think an added bonus could be extending the life of the battery in your spare fob, should you have one.
     
  10. Blackat

    Blackat Active Member

    Joined:
    Sep 29, 2023
    453
    309
    0
    Location:
    Colorado
    Vehicle:
    2023 Prius
    Model:
    Limited AWD-e
    Is this, like a city problem? I don't really understand,someone copies your fob while you're walking around then goes to your car and steals it?