BMW Steering Knuckle Assembly Cover - Genuine BMW 51757347021

Product Information

BMW Fender diagram for 840i xDrive Gran Coupe, 745e xDrive, M5, & more

A fender liner is an inner shield made of plastic, rubber, or thin sheet metal located within the wheel well of a vehicle. It acts as a protective barrier between the wheel and the fender, preventing dirt, rocks, water, and debris from damaging the fender, engine bay, and other essential components. Fender liners are especially important for protecting vulnerable parts, such as the radiator, hoses, electrical components, and suspension, from moisture and road debris.

• Visible Cracks, Tears, or Gaps: One of the most obvious signs of a failing fender liner is visible cracks, tears, or missing sections, leaving parts of the wheel well exposed
• Debris or Water in the Engine Bay: If a fender liner is damaged or missing, you may notice an increase in dirt, gravel, or water inside the engine bay or near suspension components, potentially leading to damage

About Genuine BMW

The original parts used by BMW to build your car are available as replacement parts under the “Genuine BMW” brand. When ordering a Genuine BMW part you are guaranteed to get the same part that you would pick up from your local dealerships part department. Genuine BMW parts have been built to BMW’s stringent standards and are the same quality of the original parts used to build your Ultimate Driving Machine.

You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.