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Discussion Starter #1
While changing the oil in my 2006 TDI this weekend I noticed a humming / buzzing sound when the key was in the on position coming from within the engine somewhere. When the key was off this went away instantly.

I have noticed this sound right when I turn my engine off after driving.

Any idea where this could be coming from? I originally thought fuel pump, but wouldn't that be back near the tank?
 
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