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The belt needs to be replaced from under the vehicle, you would need to lift or put the vehicle on jackstands, remove the lower shield. There is a picture that shows the tensioner and the belt routing.
The TDI is the only A4 Vehcile from VW that needs to be done from under the vehicle, even if you get the belt off from the top you wont be able to get the new belt to route on the pullies. Thanks for the accept and please advise if you need any additional help