One problem related to engine clicking and tapping noises has been reported for the 2009 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Toyota Sienna based on all problems reported for the 2009 Sienna.
I have a 2009 Toyota Sienna with about 37800 miles on the engine. This is a certified pre-owned Toyota and I bought it with approximately 33000 miles on it in November of 2010. At about 37000 I noticed a ticking noise coming from the engine at idle. It starts after the engine warms up; mostly after driving about 15 minutes. I took it to a Toyota dealer for a diagnosis and the dealer stated they heard it and it's only normal engine sound. There is a TSB 0094-09 that addresses the issue. However, my vehicle does not fall within the affected production change effective VIN according to the Toyota dealer. As a matter of fact my Sienna was manufactured about 2000 vehicles after the affected production change effective VIN. I believe the problems related to TSB 0094-09 still exist beyond the affected vins in the TSB. Toyota should really fix these problems. The engine loud ticking noise that is easily noticed is not normal.