The contact owns a 2014 BMW 535d Sedan. The contact stated that while driving at approximately 40 MPH, the contact observed hear emanating from the engine compartment. The contact stated that the temperature gauge remained hot (H). The vehicle was pulled to the side of the road and the contact stated that she observed smoke emanating from the engine compartment and she exited the vehicle. A passerby stopped, opened the hood of the vehicle, and used the extinguisher where there was smoke. The vehicle was towed to the residence. The vehicle was then towed to the dealer where they diagnosed that the intake manifold melted and needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 260,191.