One problem related to differential unit 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.
At my 120,000 service, the Toyota dealer technician reported a leaking front differential. He said it would take 16 hours to repair. The technician also mentioned that he had 3 Toyota cars currently in the shop for the same thing. This seems beyond coincidental. Clearly, Toyota has a problem with leaking seals. The difficulty to fix this problem translated into a bill of $1,404. 60 plus $31. 79 for a rental car. The bill may have been more: the car's rack and pinion was also leaking, so some of the labor was shared with that job. This amount seems extreme and either Toyota has faulty seals or, if this is a "normal" wear and tear item at 120,000 miles, Toyota has made it way too difficult to fix. Either way, this amount of expense is inordinate.