Three problems related to air bag have been reported for the 2008 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Sienna based on all problems reported for the 2008 Sienna.
Front dashboard is cracking and sticky. I have heard Toyota had a recall at one time, however I cannot find it. Also, seatbelt in the middle and rear seats lock often in place without breaking. Must unbuckle to release and reset.
Dash board cracked over glove box, then another crack appeared on the left side near the side window defrost vent. Wonder if it would affect air bag deployment?.
The passenger airbag control is intermittent, when a passenger is seated in the passenger front seat, the airbag many times is turned off. The vehicle has been taken to Toyota 2x for this problems as they point to seat belt latch, the last time after 2 weeks of the system not working, it starting working properly again. It worked for a month correctly and since started working again. This has been going on for over a year now not knowing if the passenger airbag will work in a crash. Toyota claims the airbag is connected to the latch of a seatbelt which was proven false on 2008 and 2012 models, they do not know how there system actually works, so how can they be relied on fixing it or knowing if there is a problem.