The contact owns a 2015 Ford Explorer. The contact stated that while operating the vehicle, there were exhaust fumes inside the vehicle, causing the contact headaches and nausea, and the two grandkids were complaining about headaches as well. The vehicle was taken to an independent mechanic where it was determined to have a catalytic converter failure, which was repaired, but the fumes persisted. The vehicle was taken to the independent mechanic, who determined that the exhaust fumes were coming from the rear liftgate seals. No further information was available. The vehicle was not repaired. The manufacturer and local dealer were not yet contacted. The failure mileage was 120,000.