when should the timing belt be replaced? on 2001 Audi S4

It runs fine. It has 77000 miles

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2 answers
105K is the recommended mileage. They run about $850 with a new water pump, timing belt kit including the new pulleys and some coolant and acc. belt. You've got some time to prepare. These are interference engines and will be damaged if the belt breaks or looses timing because of broken teeth.
around 90000