This DIY is how to change your Belt Tensioner on a 1.8t Audi A4 This was off a 1999 AEB Engine. Is Mine Bad?You can tell if your Belt Tensioner is going bad or is bad if you hear a whining sound when your start your car or your car is at idle...This signifies that your bearings are going bad inside the Belt Tensioner. Another way to tell is by taking the tension off the belt and spinning it by
 
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