One problem related to engine oil leaking 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 had a catastrophic oil leak all over my driveway and garage. Reseached history of this type and found it was it was a rubber hose associated with oil transfer (also called the v v t 1 actuator hose. A voluntary recall on this part ended in 2013. I will have it fixed by a local car repair shop but if this is a known part failure for years, why would Toyota not make a mandatory recall of this faulty part? my 2009 Toyota Sienna which I just purchased 2 months ago will now have a major car repair.