Audi A4 B9 Rear Door Central Lock Actuator Motor Left N/S 4G0839015F

Audi A4 B9 Rear Door Central Lock Actuator Motor Left N/S is an original component from the Locks and latches group, designed for the rear left side of the vehicle body. It ensures precise locking, stable closing, and secure retention of the door in the closed position, which translates into daily operational comfort and the proper functioning of the vehicle's opening system.

Specifications and technical data

• SKU: 4G0839015F
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0839015F
• Substitutable numbers: 4G0839015F, 4G0 839 015 F
• Location on the vehicle: Rear, Left
• Category: Exterior Locks & Lock Hardware

Purpose and function of the door lock

The presented lock is dedicated to the rear left side of the Audi body, where it is responsible for mechanical locking and cooperation with the handle and linkage system. Its design has been developed to:

• ensure the door is securely held in the closed position while driving,
• work smoothly with the factory opening mechanism from both the inside and outside,
• maintain a stable door position relative to the bodywork after closing.

Thanks to this, the lock supports proper door sealing, reduces unwanted play, and contributes to acoustic comfort inside the vehicle.

Construction and fitment for Audi A4 B9

The component has been designed specifically for the Audi A4 B9 platform, which means its geometry, mounting points, and the way it interacts with linkages and handles are adapted to the factory door system. Proper fitment translates into:

• easier installation in place of the original lock,
• maintaining the factory door line after closing,
• consistent cooperation with other door mechanism components.

Such a solution minimizes the risk of closing problems, the need for additional adjustments, or unwanted noises while driving.

Condition of the component and benefits of using a used part

The offered lock comes from the used parts segment, which allows for economical vehicle repair while maintaining the manufacturer's original specifications. Choosing such a solution is particularly beneficial when you care about:

• maintaining consistency with the factory door locking system,
• reducing service costs while maintaining OEM quality,
• using a component with a proven design, consistent with the Audi project.

A used door lock is also a sensible choice from the point of view of reusing parts, without the need to reach for cheaper replacements with uncertain fitment.

Safety and comfort of use

A functional rear left door lock is important not only for convenience but also for passenger safety. A properly working mechanism:

• reduces the risk of accidental door opening while driving,
• ensures stable locking during frequent opening and closing,
• supports the correct operation of systems related to the door mechanism (e.g., door position sensors, if provided in the vehicle's configuration).

Thanks to this, restoring the full functionality of the lock translates into more predictable vehicle behavior in daily use.

Related components and vehicle development

If you are planning a comprehensive repair or upgrade of the door area in your Audi and need other elements from the same group, such as locking mechanisms, cylinders, or strikers, check the available parts in the Audi locks and latches category.

If you are also interested in a conscious approach to vehicle service and want to better utilize the potential of recycled parts, it is worth checking out practical tips on eco-tuning – you will find them in the article Eco-tuning in practice: how to increase performance while reducing your carbon footprint with recycled parts.