One problem related to emission control 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.
The contact stated while pulling into a parking slot heard a grinding noise followed by the vehicle lurching into another parked vehicle. He took the vehicle to the dealer. The dealer could not duplicate the sudden acceleration. The dealer replaced the mass air flow sensor, oxygen sensor, and reprogrammed the ecu. The dealer could not determine what caused this problem.