NHTSA Complaint #11705757 — 2018 AUDI Q5

Vehicle: 2018 Audi Q5 Prestige Mileage: Approximately 34,000 miles On December 14, 2024, while driving at normal road speeds, my vehicle suddenly lost power and displayed multiple warning messages, including drivetrain and system malfunction alerts. The vehicle became unstable and unsafe to operate while I was in traffic, forcing me to carefully maneuver off the roadway. This occurred without any prior warning or abnormal engine behavior, it was just so sudden. I brought the vehicle to an authorized Audi dealership the following day. After inspection, the dealership diagnosed a catastrophic internal engine failure, identifying a cracked/chipped valve in cylinder 3. The dealership technicians and service staff stated that this type of failure is extremely rare on a vehicle with such low mileage and normal maintenance history. They also indicated that they had not encountered this type of valve failure on a similarly maintained Audi vehicle at this mileage. There was no evidence of carbon buildup or abuse, and no external contributing factors were identified. The failure resulted in sudden engine malfunction and loss of drivability while the vehicle was in motion, creating a significant safety risk. The dealership recommended replacing the engine cylinder head, with an estimated repair cost approximately $9,100. The dealership could not confirm whether debris from the damaged valve remained in the engine or whether the repair would fully mitigate future safety risks. I am submitting this complaint due to concerns that this failure represents a potential manufacturing or materials defect that can lead to sudden engine malfunction or loss of power while driving, posing a safety hazard to vehicle occupants and other road users.