Odd Tyre Pressure Warning

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by rhud, Jul 11, 2017.

  1. rhud

    rhud Hardcore MB Enthusiast

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    Was driving my w169 A Class yesterday and out of the blue got a big red 'Check Tyre pressures' warning on the display. All tyres looked ok,pressures normal. Then asked to reset pressure warning system which I did and went on my way. Anyone had anything similar?
     
  2. grober

    grober MB Club Veteran

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    If the car doesn't have discrete internal tyre pressure sensors then its likely it relies on the ABS wheel speed sensors to monitor wheel rotational speeds - a tyre that's going flat will have a different rolling radius from the others showing up as a speed difference which the system flags up as a potential flat tyre.
     
    2 people like this.
  3. PobodY

    PobodY Hardcore MB Enthusiast

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    On mine the tyre(s) is rarely completely flat, but one or more of them might be lower than the others.
     
  4. Harrythedog

    Harrythedog Hardcore MB Enthusiast

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    Had it before on a motorway roadworks section. Put it down to the uneven road whilst crossing the contra-flow
     
  5. PobodY

    PobodY Hardcore MB Enthusiast

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    Ironically roadworks on the M6 are almost always when my warning pops up. - I think the low profile tyres are more prone to loss from knocks.
     

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