One problem related to catalytic convertor 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.
There is a sulfur smell when I stop or back up on hills. The dealer said that they would replace the catalytic converter (parts are on order) and that this was a defect in some vehicles. If an owner mentions the smell, they do the repair under warranty. Shouldn't owners be made aware of the problem?.