One problem related to oil pump has been reported for the 2007 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Toyota Sienna based on all problems reported for the 2007 Sienna.
The oil pump assembly failed. It was partially made with a rubber hose that did not perform as it should. It needed to be replaced with a solid metal part. Although there was a safety/service bulletin listed by Toyota on this part it cost almost $1200 to repair.