Agency wants to charge $2,900 to fix tiny oil leak. Is this normal?

Hello, Anytime you have a question like this, get a second opinion if at all possible. Try one of our certified repair facilities for a quote, they are trustworthy. I'll put a link below, but it looks like Daves Ultimate Automotive in Austin or Ceder Park will be your best bet. Let me know should you have ANY concerns. As for the cost of the leak, there are many that could run up that sort of bill on the Sienna, because access is very restricted in the engine bay. Just make sure you verify the repair with a second opinion. http://repairpal.com/toyota-within-10-miles-of-austin-texas-78738