One problem related to power train driveline has been reported for the 2004 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Highlander based on all problems reported for the 2004 Highlander.
I have a 2004 Toyota Highlander with approximately 70k miles. For the second time the wheel bearings have failed on the vehicle. I spoke with Toyota and they do not believe it is a safety issue even though this is a know issue (all over the web). I believe anything related to the drivable/steering is a safety issue and Toyota should further investigate the failures.