Catalytic Convertor problems of the 2014 Jeep Compass

The contact's daughter owns a 2014 Jeep Compass. The contact stated that initially, while driving approximately 65 mph, the rear-end of the vehicle was swaying. Upon inspection, there was severe rust on the rear suspension of the vehicle. The vehicle was taken to a mechanic who diagnosed that there was severe rusting to the rear suspension, with fractures on the passenger's side of the vehicle, with a fractured, detached suspension on the driver's side. The mechanic replaced the rear sub-frame, stabilizer links, and control arm. Approximately one year later, after driving 130,000 additional miles, the daughter informed the contact that oil needed to be added more frequently. The contact was informed that while her daughter was driving approximately 65 mph, the vehicle lost motive power and decelerated quickly; and while depressing the accelerator pedal, the engine revved abnormally and coasted before decelerating. The driver was able to make it to the nearest parking lot and turned off the vehicle. The vehicle was towed to a certified mechanic, who diagnosed the vehicle with a rear catalytic converter failure; however, replacing the part failed to fix the vehicle. The mechanic advised the contact to take the vehicle to a dealer for assistance. The vehicle was towed to a dealer and was diagnosed and determined that the catalytic converter and oxygen sensors had failed; however, the vehicle was not repaired. Subsequently, a different mechanic replaced the front catalytic converter and performed an oil change. The manufacturer was informed of the failure and confirmed that the VIN was not under recall. The manufacturer referred the contact to the NHTSA hotline to report the failure. The failure mileage was unknown.