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Tyre pressure fluctuating - what's causing this please?

  • 09-12-2021 2:40pm
    #1
    homenotaway
    Registered Users, Registered Users 2 Posts: 187 ✭✭


    Hi all and TIA for any and all replies to my query.

    Yesterday the alarm sounded (and the light came on) that my left front tyre had decreased pressure. It was checked in a tyre shop, no puncture was found and inflated to 35 PSI. The alarm sounded again on the way back to the house, I measured it then and it read 27 PSI. This morning it is reading 38 PSI. I haven't driven the car yet today.

    Can anyone explain what is happening?



Comments

  • #2
    redcup342
    Registered Users, Registered Users 2 Posts: 1,387 ✭✭✭redcup342


    https://www.boards.ie/discussion/2058222087/tyre-pressure-fluctuating-whats-causing-this-please

    The air is expanding and contracting depending on the temperature outside.



  • #3
    kirving
    Registered Users, Registered Users 2 Posts: 6,129 ✭✭✭kirving


    Did you measure it using a separate tool, or via the car's computer?



  • #4
    micks_address
    Registered Users, Registered Users 2 Posts: 9,004 ✭✭✭micks_address


    its not unusual for me to see tyre pressure lights on as temp drop in the autumn/winter..



  • #5
    pdpmur
    Registered Users, Registered Users 2 Posts: 214 ✭✭pdpmur


    Tyre pressure gauges can be quite inaccurate. The ones attached to the ends of air lines that you would traditionally find in garages are notoriously unreliable. If you are making measurements with different gauges at different times then this could explain the big differences. If your car has a TPMS then the measuring valve could have become faulty.



  • #6
    maestroamado
    Registered Users, Registered Users 2 Posts: 4,425 ✭✭✭maestroamado


    https://www.boards.ie/discussion/2058222087/tyre-pressure-fluctuating-whats-causing-this-please

    from what you say it appears you have a tester and tested with 2 times... it seems the tester dodgy...



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  • #7
    homenotaway
    Registered Users, Registered Users 2 Posts: 187 ✭✭homenotaway


    Thanks all for your replies. I only bought the tyre pressure gauge yesterday evening. I tested all 4 tyres but the only one which tested differently was the one which triggered the alarm/light.

    A suggestion which was made by the tyre shop guy was that sometimes if a bearing is at fault the tyre pressure alarm is triggered.


    The car is 2017 if that's of any help 🤷‍♀️



  • #8
    zg3409
    Registered Users, Registered Users 2 Posts: 7,034 ✭✭✭zg3409


    Look at the door where it displays the recommended tyre pressures. Some cars display the recommended pressure beside the actual pressure. Put in 3 or 4 psi more than needed and ensure error goes away. Then you can put in the right pressure at a later date. If you fill tyres when wheels are warm from driving, it will drop when cold.



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