Four problems related to steering rack and pinion have been reported for the 1999 Toyota Sienna. The most recently reported issues are listed below.
Rack and pinion failure caused excessive tire wear and vehicle pulling.
When turning the steering wheel to the left, the steering wheel does not return smoothly. The dealer is replacing the rack and pinion because of the problem. Dealer required one month to fix properly.
When making a left turn vehicle continues to turn left unless manually turning steering back to right, and clicking is heard.
The van has a problem with sticky return-to-center after 90 degree left turn. Tends to happen if speed is above 20 miles per hour during turn. Require jerking or swerving to return to center after a left turn. My wife thought I was swerving since the car was swaying but I was just trying to prevent us from making a full circle to the left. The sticking problem happens irrespective of road condition. I have reported it to the dealer, who checked the fluid but did not pursue the problem.