The contact owns a 2015 Mazda Mazda6. The contact stated that while driving at an undisclosed speed, there was a loud clanking sound coming from the rear end on the passenger’s side. The contact stated that while the vehicle was parked, the contact noticed that the rear end of the vehicle was severely corroded. The contact reached out to a mobile independent mechanic, and it was determined that the underbody of the vehicle was severely damaged and could not be repaired or replaced. The dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 111,000.