One problem related to engine knocking noise has 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 contact owns a 2001 Toyota Sienna. While the contact was driving 65 mph he noticed that the check engine light appeared on the dashboard, moments later the contact heard a knocking sound. The vehicle was taken to the dealership where the contact was informed that the engine needed to be replaced due to excessive engine sludge. There were no prior warnings. The current and failure mileages were 105,000.