One problem related to catalytic convertor has been reported for the 2015 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Toyota Highlander based on all problems reported for the 2015 Highlander.
The contact owns a 2015 Toyota Highlander. While driving approximately 40 mph, an abnormal odor emitted inside the vehicle. The driver and passenger sustained headaches and sore throats. The vehicle was taken to the dealer where the technician stated that an undercoating was applied to the catalytic converter during production that emitted a chemical odor inside the vehicle. The manufacturer was not notified of the failure. The failure mileage was 5.