Steering Idler Arm problems of the 2006 Mercedes Benz R350

Tl- the contact owns a 2006 Mercedes Benz R350. The contact stated that while backing up the vehicle made an abnormal noise then the steering wheel seized and the vehicle smoked from under the hood; the contact turned the engine off. The vehicle would not restart. The vehicle was towed to a local mechanic and was diagnosed that the power steering pump and serpentine belt, idler pulley be replaced. The vehicle was repaired. However, the contact stated that the check engine light stayed on. The approximate failure mileage was 130,000. The manufacturer was contacted. Bd.