One problem related to steering noise has 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.
Since, I've bought this van in late 2009, I have always felt a clicking noise in the steering wheel during turning. Now that the noise is getting worse, I am reading online that there's some kind of manufacturing defect and TSB's issued about the intermediate steering shaft as corrosion sets in those with time. Also, it seems like that oil from steering rack is leaking and that seems to be a problem with multiple Toyota Siennas starting from 2006. Toyota should take responsibility for these manufacturing defects and correct the issues as these can lead to steering failure & can be fatal.