Illustration1. What component or system failed or malfunctioned, and is it available for inspection upon request? The suspected failed component is the front differential carrier bearing on my 2021 BMW 750i xDrive. [XXX] BMW of Westmont, Illinois diagnosed carrier bearing damage and oil leaks and recommended replacement of the front differe…
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1. What component or system failed or malfunctioned, and is it available for inspection upon request? The suspected failed component is the front differential carrier bearing on my 2021 BMW 750i xDrive. [XXX] BMW of Westmont, Illinois diagnosed carrier bearing damage and oil leaks and recommended replacement of the front differential. The vehicle has approximately 53,791 miles. The failed differential/carrier-bearing assembly is currently available for inspection, subject to the vehicle remaining at the dealership and before the component is replaced or discarded. I have specifically requested that BMW and the dealership retain the failed component if inspection or engineering analysis is necessary. The dealership's repair order is XXX, dated XXX. 2. How was your safety or the safety of others put at risk? The vehicle developed a significant grinding noise during acceleration from a stop. The grinding continues for approximately 5–15 seconds, depending on how long the vehicle is under acceleration, and goes away after the vehicle reaches approximately 30–40 MPH. I am concerned that failure of a major front drivetrain component could result in an unexpected loss or interruption of proper power transfer, particularly during acceleration from a stop or at low speeds. The vehicle also has a documented differential oil leak progressing to a drip. I am concerned that continued loss of differential lubricant could contribute to further mechanical damage or failure. I have therefore limited use of the vehicle while seeking diagnosis and determining the appropriate repair. 3. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. The vehicle was inspected by Laurel BMW of Westmont, Illinois, an authorized BMW service center. The dealer documented the customer's complaint as a grinding noise when accelerating from a stop and documented the diagnosis: “Front differential replacement due to carrier bearing ,oil leaks INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA),