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Administrator, Resident Tater Salad
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While those certainly put more of a load on the serpentine belt/engine at idle, it would strike me as odd that the sound's coming from the timing chain/camshaft sprocket area.

The serpentine belt tensioners on these engines have been known to fall apart or just stop holding tension on these cars, which will usually result in a chirping belt or something of the sort. If you have definitely ruled out that as the source of the noise (try listening around with a paper towel roll or something that you can point at things to isolate the source of the noise, I think the timing chain/tensioners would be a powertrain warranty claim. This would be the first I've heard of on the 1.4T.
 

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Administrator, Resident Tater Salad
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17,598 Posts
Not a powertrain coverage but the tensioner itself isn't too hard to change.

It would be a good time for the belt. That does require removal of the top engine mount & support of the engine from below (a piece of wood on top of a floor jack will do the trick).
 
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