Q: I have a 2011 Audi A4 Avant 2.0 turbo and my car just started screeching we the idle is low. It sounds like a belt is slipping

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I have a loud screeching sound coming from my engine when the idol is low. Could it be the belt tensioner? The screeching stops when I give the car some gas or exellerait. Do you have an idea what it might be? Thanks

My car has 77000 miles.
My car has an automatic transmission.

2011
drive belts (ex. serpentine, v-belt)
Audi
A4
L4-2.0L Turbo
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