Five problems related to steering wheel have been reported for the 1998 Toyota Sienna. The most recently reported issues are listed below.
While turning the wheels froze, and I was unable to control the car. I had to jam on the breaks in order to keep myself from going off the road. . . Very dangerous situation.
When accelerating from a stop and making a left turn, steering assembly will momentarily not return to center, but will stick at ~30degrees left of center. Effort is required to return steering to center, else it will remain in locked position. Only affects left turns and only when accelerating, otherwise undpredictable (not _every_ turn). Not related to engine or external temperature.
While driving something in steering wheel broke and lost control of steering. Steering wheel would no longer turn wheels on vehicle. Dealer contacted.
When turning left and accelerating, the steering wheel "sticks" and must be manually pulled back to center.
While making a left turn the steering wheel sticks/locks instead of automatically returning to center, the problem seems to be more noticeable in warm weather, dealer has been unable to find the problem. Nlm.