Four problems related to engine have been reported for the 2001 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Sienna based on all problems reported for the 2001 Sienna.
The engine of my Toyota Sienna 2001 with an identified oil sludge problem seized while driving at highway speeds. Vehicle could not be controlled and my toddler threw up in fear as we tried to avoid being smashed into while the car coasted to a stop. Mechanic repeatedly said cam seized, metal filings found, and "could not think of any other reason but the sludge problem. " Toyota refused to repair the vehicle under unlimited mileage, 8-year warranty. Car is presently with dealer and may be examined by engineers from NHTSA (dealer agreed on 12/22/05). This failure was predicted by another dealer. Car always smoked--blamed on "new engine break in", "lack of maintenance", etc. Later Toyota sent letter about the issue. This time dealer agrees maintenance was excellent.
Engine check light came on while driving. Took to dealer, had to replace vacuum switch. 2 days later, same problem occurred.
The engine had to be replaced due to an oil sludge build-up.
Defective engine due to manufacturing defect.