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Knocking sound under bonnet 2009 103TDI

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  • #1

    NSW Knocking sound under bonnet 2009 103TDI

    Hi all,

    I was wondering if someone could please help me out with this.

    I recently purchased a 2009 103TDI Comfortline VW Golf. I've noticed on occasion after I turn the ignition off, there is a knocking sound under the bonnet for a few seconds. The car itself runs fine and I've looked online and haven't managed to find any information about it. It doesn't happen every time I drive, at least not as far as I can tell.

    The car does need a new pressure sensor which I am in the process of getting, and I have been told this doesn't affect the driving of the car.

    Could the knocking sound be caused by the pressure sensor or is it something else? Should I get it looked at or is it normal?

    Any help with this would be much appreciated!!

    Thanks!
    Tags: car, knocking, looked, sensor, sound
  • #2
    Could potenitally be the dual mass flywheel.

    It'll be a deep, constant knock at idle, but go away when rev'd.
    '07 Transporter 1.9 TDI
    '01 Beetle 2.0

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    • #3
      No not the dual mass fly wheel if it makes the sound for a few seconds after it's turned off, could you be more specific, has the engine stopped turning, or is it as it winds down to a stop, if it is as the engine slows to a stop then maybe yes flywheel separating, if after stopping it is something electrical that may be worn and knocking.

      Cheers, Scott.
      1976 Martini Olive Mk1 2 door Swallowtail
      1981 black Mk1 ragtop GTI in need of some tlc
      1979 Mk1 2 door - long term project
      2002 Oettinger V5 Bora - daily driver

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