Audi A8 D4 Door Lock Mechanism Actuator Keyless Go Rear Left N/S 4H0839015

Audi A8 D4 Door Lock Mechanism Actuator Keyless Go Rear Left N/S is an original component from the Locks and Latches group, designed for precise operation of the rear left door in the Audi A8 D4 generation model. It ensures proper integration with the Keyless Go system, maintaining correct door locking, unlocking, and latching functionality according to the manufacturer's standards.

Specifications and technical data

• SKU: 4H0839015C
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0839015C
• Substitutable numbers: 4H0839015C, 4H0 839 015 C, 4H0839015
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function in the vehicle

The presented lock mechanism is dedicated to installation in the rear left part of the Audi A8 D4 body. It is responsible for:

• mechanical locking and unlocking of the door from the body side,
• cooperation with the electric actuator controlled by the comfort electronics,
• integration with the Keyless Go system, allowing the lock to be operated without using a traditional key.

Thanks to the precise fit to the door structure, this component allows for maintaining factory tightness, proper closing, and correct operation of the handle and internal linkages.

Construction and compatibility with the Keyless Go system

The lock mechanism integrated with the actuator has been designed to work with the electrical installation and comfort module of the Audi A8 D4. In practice, this means:

• properly selected mounting points to the door structure,
• adaptation for operation in keyless mode,
• maintaining the correct sequence of opening and locking signals in the comfort system.

Such a solution reduces the risk of communication errors in the comfort system and allows for the efficient restoration of full door functionality after replacing a damaged lock.

Benefits of using an original mechanism

Using an original lock mechanism in the Audi A8 D4 brings a number of practical advantages:

• Factory fit – proper alignment with the door structure and upholstery elements, without the need for modifications.
• Correct cooperation with electronics – maintaining full functionality of the Keyless Go system and central locking.
• Stable actuator operation – properly selected gear ratios and working stroke, which translates into repeatable locking and unlocking.

For the user, this means a lower risk of door closing problems, dashboard error messages, and the need for repeated service interventions.

Placement and assembly aspects

The component is intended for installation in the rear left part of the body. In practice, the assembly involves removing the door upholstery, disconnecting the existing lock, and connecting the new mechanism to the installation and linkages. Thanks to the design consistent with factory solutions, assembly work can be carried out in an orderly manner, maintaining the original routing of wires and cables.

Condition and service application

The offered lock mechanism is a used part, which makes it an attractive service solution in situations where it is necessary to replace a faulty lock while maintaining reasonable repair costs. This type of component is particularly useful in case of:

• failure of the actuator responsible for locking,
• problems with the Keyless Go system operation in the rear left door,
• mechanical damage to the lock after a collision or external interference.

If you are planning a comprehensive repair or upgrade of the door security zone in your Audi and need other elements from the same group, such as inserts, latches, or complete door mechanisms, check the available parts in the Audi Locks and Latches category.

For drivers interested in a broader cabin upgrade, including improving comfort and interior aesthetics using aftermarket elements, the guide article Premium interior for half the price: second-hand seats, steering wheels, and multimedia, which discusses the practical aspects of selecting and installing used equipment, may be helpful.