Yellow Exclamation mark on dashboard not related to tire pressure, help

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Purple Penguin, Oct 14, 2016.

  1. Purple Penguin

    Purple Penguin New Member

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    I have a 97 Prius with 187,000 miles, and I left it in a parking lot for about 10 days due to a trip. After I start the car, the yellow exclamation mark was on. From my previous experience, I assume that the air pressure in the tires may be low. I put some air in the tires, first I did it wrong and put too much pressure (38psi). The light blinked when the car first starts, then kept on. I brought it to a shop and they say the problem may be too much air, and reduced the pressure to 32 psi, the yellow exclamation mark was still on after initial blinking. But I am already on the way and did not go back. I think I find better answers on this forum than repair shops.

    Are there other common problems that could cause the "yellow exclamation mark" to be on?

    I feel nervous driving it around.
     
    #1 Purple Penguin, Oct 14, 2016
  2. Don Shouse

    Don Shouse Junior Member

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    The tire warning light Blinking and then staying on indicates one of the sensors inside the tire has failed.
     
    #2 Don Shouse, Oct 23, 2016
  3. wjtracy

    wjtracy Senior Member

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    Yes could be TPMS. I lost my first TPMS sensor at 9.5 years, and depending on when the 2007 was manufactured you could be hitting 10-years soon. I still have three good TPMS at over 10 years.

    You know of course they run on permanent solder-connection type button batteries, so like all button batteries, they have a finite life...10-years is quite amazing. If Toyota would only give us display of the valuable data generated daily by these units, we'd really have something cool.
     
    #3 wjtracy, Oct 23, 2016
  4. Don Shouse

    Don Shouse Junior Member

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    Exactly. I recently lost my first sensor one on my '07. Not a bad track record!
     
    #4 Don Shouse, Oct 23, 2016
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    Just editorial: it's a 2007?

    Maybe let go of your experiences and assumptions, lol, have a look in the Owner's Manual:


    upload_2016-10-23_10-44-11.png
    upload_2016-10-23_10-49-1.png
    upload_2016-10-23_10-50-20.png

    Well, the above seems to be going nowhere fast. One thing for sure: there is no mention of tire pressures. My take: the triangle with explanation mark is serious. I would stop adjusting tire pressures, get it to a Toyota dealership to read codes, do a decent diagnosis. Protracted driving without resolving this could be causing further damage.

    What kind of shop? Toyota dealership? Or?
     
    #5 Mendel Leisk, Oct 23, 2016
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