The contact owns a 2016 Nissan Sentra. The contact stated while driving 25 MPH, the accelerator pedal made an abnormal vibrating grinding sound. The check engine warning light was illuminated. The vehicle was taken to Ray Automotive, where an air flow sensor was replaced; however, the check engine warning light remained illuminated. The vehicle was taken to the dealer, where an air flow sensor was replaced under warranty; however, the failure recurred increasingly. The contact stated that the transmission was slipping while driving. The vehicle was taken to Ray Automotive, where the transmission fluid was replaced; however, the failure persisted. The mechanic determined that the transmission had failed. The vehicle was then taken to Richard Automotive, where it was determined that the transmission had failed and needed to be replaced. The vehicle was not repaired. The contact stated that the vehicle was out of warranty. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 92,000.