One problem related to engine knocking noise 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.
Toyota Sienna 2004, 19,000 miles not even 2 years old. 1. Valves making noise when driving up hill at slow speed or when start driving. 2. Wind noise is unacceptable. Problem begins at the very first day of driving the car. 3. One big knocking noise when the vehicle is moving , only when shift from park to d4 and starting to drive.