Audi A4 B8 Front Door Left N/S Brilliant Black Metallic - LY9B

Listing details and visual condition of the part

Possible scratches and paint chips – condition as shown in the product photos.

The offer applies to the bare door – without handle, window, lock, trims, or any other accessories.

There is an option to purchase a complete door for an additional fee of 80 GBP.

Audi A4 B8 Front Left Door Brilliant Black is an original body part from the Doors and door panels group, designed for installation on the driver's side at the front of the vehicle. Thanks to the factory paint in the Brilliant Black Metallic - Y9B shade, it allows for a visually consistent body repair without the need for costly painting of the entire side of the car.

Specifications and technical data

• SKU: 8K0831051J-BBL
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0831051J
• Substitutable numbers: 8K0831051J, 8K0 831 051 J
• Location on the vehicle: Front, Left
• Color: Brilliant Black Metallic - Y9B
• Category: Doors & Door Skins

Purpose and Fit for Audi A4 B8

The presented door has been designed specifically for the Audi A4 B8 generation model, taking into account body geometry, crease lines, and factory mounting points. Its placement in the front area, on the left side of the vehicle, ensures full compatibility with the A-pillar, sill, and fender structure, facilitating precise alignment with other body panels.

As a part from the Doors and door panels category, this component serves as a load-bearing base for the window, lock, seals, and electrical system, maintaining the factory rigidity and safety parameters intended by the vehicle manufacturer.

Brilliant Black Metallic - Y9B Paint Characteristics

The door is finished in the Brilliant Black Metallic - Y9B color, which is one of the popular dark shades used in the Audi A4 B8. The metallic paint structure ensures uniform light reflection and aesthetic matching with other body elements in the same color code, minimizing the scope of potential painting work.

For body shops and end-users, this means faster repair completion, easier visual matching, and a reduced risk of tonal differences between the new panel and adjacent body parts.

Structural Function and Installation

The front left door in the Audi A4 B8 plays a significant structural role in the side body area, cooperating with hinges, the lock, and the sill and roof seals. A properly selected door panel:

• ensures correct window guidance in the channels,
• allows for a tight seal against body seals,
• maintains the correct gap geometry between the fender, sill, and B-pillar,
• serves as a carrier for interior trim elements such as upholstery or speakers.

The original door construction facilitates installation at factory points, resulting in stable seating, proper lock operation, and acoustic comfort inside the vehicle.

Used Condition and Benefits of Choosing OE Parts

The item is offered in used condition, representing a reasonable compromise between repair cost and maintaining factory construction quality. In practice, this means the possibility of restoring full functionality to the door area without the need to invest in a new body panel, while preserving original geometry and compatibility with other components.

Choosing doors from OE production promotes the technical consistency of the vehicle, facilitates installation, and minimizes the risk of fitment issues typical of lower-precision aftermarket replacements.

Expanding Door Area Repairs in Audi

If you are planning a comprehensive repair or upgrade of the door area in your Audi and need other parts from the same group, such as skins, reinforcements, or door frames, check the available parts in the Audi Doors and door panels category.

For users who are simultaneously servicing the drivetrain or preparing the car for more extensive mechanical work, a guide on diagnosing and selecting clutch and dual-mass flywheel parts may be helpful – you can find it in the article Clutch and Dual-Mass Flywheel – Diagnosis and Part Selection for the Drivetrain.