the belt change interval is 75,000 miles or every 5 years so as its a 2011 car then a belt change is required
this is the latest information as the original handbook may mention 115,000m miles but Audi have since revised this
on some cars the water pump may also be replaced when you do the belt as this has a tendency to start leaking around 80K miles
if you're just doing the belt then its about 3hours labour + £200 in parts
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