One problem related to manual transmission has been reported for the 2004 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sienna based on all problems reported for the 2004 Sienna.
2004 Toyota Sienna steering. Steering suddenly binds while attempting to turn. Very hard to steer at times. Hard to control. There is 2 to 3 seconds delay and slight acceleration lag even when taking off from a stop. Couple of times I was close to run into accident.