BMW 1 Series E81 E82 E87 E87N E88 Deflector Lip Rear Left N/S 7117637

BMW E81 E82 E87 Underbody Sill Cover Left Rear is an original body part designed for installation on the rear left side of the underbody. This type of cover is responsible for protecting the sill and floor area from dirt, moisture, and mechanical damage, which is important for both body durability and subsequent service maintenance. Thanks to factory-fitment for the BMW 1 Series, installation is predictable, and the element's geometry remains consistent with the manufacturer's specifications.

Specifications and technical data

• SKU: 7117637
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7117637
• Substitutable numbers: 51717117637, 7117637
• Location on the vehicle: Rear, Left
• Category: Other Exterior Parts & Accessories

Vehicle Application and Placement

The presented underbody sill cover is designed for use in the rear – left side of the vehicle. It covers the sill area and a portion of the floor, creating a barrier against water, mud, road salt, and minor stone impacts. A correctly installed cover stabilizes airflow under the car and limits the accumulation of contaminants in critical structural points.

This component is particularly important for vehicles used in urban conditions and on roads with poorer surfaces, where the underbody is exposed to frequent contact with contaminants. The use of a dedicated cover helps maintain the proper condition of anti-corrosion coatings and facilitates subsequent service work in the sill area.

Technical Characteristics and Fitment

This cover belongs to the BMW OE class of body parts, meaning it retains factory geometry, mounting points, and compatibility with original brackets and fasteners. As a result:

• it fits the manufacturer-intended mounting points on the rear left side of the underbody,
• it does not require modification to the sill or floor structure,
• it maintains the correct underbody contour, which is important for aerodynamics and corrosion protection.

The part comes from the Miscellaneous category, which in practice means a specialized, structural body component that is not a typical wear part but contributes to the long-term durability of the vehicle.

Condition, Origin, and Service Application

The underbody sill cover is offered as a used part, which for BMW body components allows for an economical restoration of underbody completeness while maintaining original specifications. This type of component is particularly useful in situations such as:

• the absence or damage of the factory cover after a collision or contact with an obstacle,
• the need to complete missing elements after bodywork and paint repairs,
• underbody reconstruction in fleet or heavily used vehicles.

Using an original cover instead of aftermarket alternatives of uncertain origin reduces the risk of installation problems, gaps, or improper fit to the sill and floor.

Benefits of Installing the Underbody Sill Cover

Replacing or supplementing the sill cover on the BMW 1 Series brings tangible operational benefits:

• Enhanced Corrosion Protection – reduces direct contact of the sill and floor with water, mud, and road salt.
• Stable Underbody Geometry – maintains the continuity of the underbody structure, affecting airflow and protecting nearby conduits.
• Easier Serviceability – an organized underbody cover system facilitates disassembly and reassembly during inspections and repairs.
• Consistency with Factory Construction – using an OE part ensures compliance with the manufacturer's technical documentation.

Related Products and Technical Knowledge

If you are looking for other parts from the BMW Miscellaneous category, including covers, brackets, or additional body components, check out our dedicated offer: BMW Body and Underbody Miscellaneous Parts. This will allow you to easily complete your missing parts in one place, maintaining brand and specification consistency.

When working with underbody components such as sill covers, it is useful to understand the structural differences between various model lines and performance versions. In this context, an article comparing technical solutions in sports models may be helpful, available here: Audi RS vs. Other Models – What Lies Under the Hood and Underbody?. This provides a good supplement to knowledge about underbody construction and the impact of covers on vehicle operation.