Knocking sound under bonnet 2009 103TDI

[greygolf]

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!

[Umai Naa!!]

Could potenitally be the dual mass flywheel.

It'll be a deep, constant knock at idle, but go away when rev'd.

[Mk1sleeper]

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.