How do I know if my Audi A4 needs a new timing belt?

I recently purchased a used Audi A4 and I am not sure if the timing belt has been replaced. Is there a way to check if it needs to be replaced or should I just go ahead and replace it as a preventative measure?

It's always a good idea to replace the timing belt as a preventative measure, especially with a used car. You can check the service records to see if the timing belt has been replaced before, but if the previous owner didn't keep good records, it's better to err on the side of caution and get it replaced.