One problem related to check engine light on has been reported for the 2005 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Sienna based on all problems reported for the 2005 Sienna.
: the contact stated the vehicle had difficulty switching gears and caused acceleration issues. The service dealer stated the computer system adjusted to the driver and this was a normal function. However, the contact stated the gears did not shift properly. Updated 10/18/2006 - the vehicle would hesitate when picking up speed. The check engine light illuminated. The dealer found code for evap purge valve. The technician found the vacuum lines off at intake.