One problem related to engine rattling and whining sounds 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.
: the contact stated a loud rattling noise was heard coming from the engine compartment of the vehicle every time it was started. There were no indications of any additional problems. The vehicle was taken to a sales dealer three times, and the dealer was unable to duplicate the problem. Update onh 06/05/2006.