Audi A4 B9 Rear Door Lock Assembly Actuator Mechanism Left N/S 4G0839015M

Audi A4 B9 Rear Door Lock Assembly Actuator Mechanism Left N/S is an original component from the Locks and latches group, designed for the rear left section of the vehicle body. It ensures precise integration with the factory locking system, which translates into stable door operation, proper locking, and safe vehicle use.

Specifications and technical data

• SKU: 4G0839015M
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0839015M
• Substitutable numbers: 4G0839015M, 4G0 839 015 M
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function of the mechanism

The presented mechanism is dedicated to installation in the rear left part of the Audi A4 B9 generation body. It is responsible for the mechanical locking of the door, interaction with the handle, and the central locking control system, ensuring proper closing and unlocking of the door leaf in daily operation.

Thanks to a design consistent with factory solutions, full compatibility with the original wiring and mounts is maintained, which facilitates installation and reduces the risk of fitment issues.

Construction and fitment for Audi A4 B9

The lock mechanism has been designed for the specific Audi body, taking into account the geometry of the rear left door pair. The arrangement of levers, catches, and mounting points is adapted to the factory door panel and standard guides, which allows for maintaining the proper operation of the external and internal handles.

The original origin from the Audi group means consistency with the vehicle's safety systems, such as locking while driving or interaction with the central body control, without the need for additional modifications.

Benefits of using an original lock

Using a factory mechanism to replace a worn or damaged part allows you to restore:

• proper closing and locking of the rear left door,
• stable interaction with the central locking and body electronics,
• consistent operation with other locks in the vehicle.

Choosing a part from the Locks and latches group from the same brand minimizes the risk of play, improper fitment, or accelerated wear, which is important for both user comfort and passenger safety.

Condition and service application

The item is in used condition, making it a reasonable cost-effective alternative for post-accident repairs, replacement after mechanical failure, or when dealing with door locking issues. In practice, it will work well both in workshops specializing in the Audi brand and for DIY repairs performed by experienced users.

Thanks to the preservation of the original design, it is possible to carry out the replacement based on standard service procedures, without the need to adapt mounting elements or interfere with the door structure.

Expanding the scope of repairs and additional materials

If you are planning a comprehensive repair or modernization of the door lock area in your Audi and need other elements from the same group, such as latches, cylinders, or additional door mechanisms, check out the available parts in the Audi Locks and latches category.

For broader service work, including comfort, air conditioning, and heating systems, a guide describing the selection of used OEM components and the service schedule may be helpful – you can find it in the article Air conditioning and heating – parts selection and maintenance for year-round comfort.