One problem related to oil pump has been reported for the 2006 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Sienna based on all problems reported for the 2006 Sienna.
Our vehicle has 119,698 miles of wear. We had our vehicle serviced at a reputable dealer. While stationary, both a wheel stud (during tire rotation), and the oil pump tensioner bolt hole (during service) broke. Dealer told us excessive force was not used. I believe inferior metal used in manufacturing.