Audi A8L 4H Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit 4H0827851A

Audi A8L 4H Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit is an original component from the Tailgates and rear parts group, designed for installation in the rear section of the vehicle body. It ensures smooth, controlled opening and closing of the trunk lid, supporting the comfortable operation of the large Audi limousine. This solution allows for restoring the full functionality of the electric tailgate while maintaining factory performance characteristics.

Specifications and technical data

• SKU: 4H0827851A
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0827851A
• Substitutable numbers: 4H0827851A, 4H0 827 851 A
• Location on the vehicle: Rear
• Category: Boot & Hatch Lids

Purpose and function of the actuator

The presented actuator is a component of the electric tailgate assistance system in the Audi A8L 4H generation model. It is responsible for generating the controlled force required to open and close the lid, working in conjunction with the control module and position sensors. It is mounted in the rear of the vehicle, in the trunk area, where it carries the loads resulting from the weight of the lid and the operation of the hinge mechanism.

Thanks to the use of the original design, the correct movement geometry, appropriate operating speed, and the quiet mechanism operation characteristic of Audi are maintained. This is particularly important in premium class cars, where acoustic comfort and the refinement of body components are of great significance.

Construction and performance parameters

The electric tailgate actuator in the Audi A8L 4H is designed as an integrated mechanical-electrical assembly. It combines the drive, gearbox, and guide elements in a single housing, which facilitates installation and service. The construction is adapted for operation in the rear of the body, where it is exposed to temperature changes, moisture, and vibrations originating from the suspension.

Key performance features include:

• stable operation across the full range of lid movement,
• precise guidance of the trunk lid during the closing phase,
• compatibility with the factory vehicle control system,
• construction designed for repeated opening and closing cycles.

Using the original actuator allows for maintaining compliance with factory comfort system settings and avoiding issues with calibration or communication with the vehicle's electronics.

Benefits of using an original component

Choosing an electric tailgate actuator dedicated to the Audi A8L 4H provides a range of practical operational benefits. Above all, it enables the restoration of the proper functioning of the automatic opening and closing features, which is important for both user convenience and safety – a properly functioning system reduces the risk of the lid not closing completely.

Original fitment translates into proper alignment with body mounts and compatibility with the existing electrical harness. This facilitates installation and limits the need for system modifications. Additionally, using a component from the same design group as the factory-installed one maintains the consistency of the entire tailgate system, including the lock, hinges, and sensors.

Vehicle placement and installation aspects

The actuator is intended for installation in the rear of the vehicle, in the trunk lid area. Its location has been designed to optimally transfer the loads associated with the movement of the lid and to work with the other elements of the mechanism. When replacing, it is recommended to follow the service procedures provided for this model, including properly securing the lid and checking for correct operation after installation.

Used condition means that the part comes from dismantling, which in practice allows for combining factory fitment with a more favorable cost compared to a new subassembly. This is a solution often chosen for repairs of high-end vehicles, where a balance between quality and budget is important.

Expanding the Audi tailgate system

If you are planning a comprehensive repair or upgrade of the rear body area in your Audi and need other elements from the same group, such as lid hinges, locks, or additional supports, check the available parts in the Audi Tailgates and rear parts category.

Additional technical and comparative information

When planning repairs in premium class cars, it is worth considering not only the part itself but also the general service strategy and operating costs. In the case of other brands and subassemblies, comparative analyses regarding durability and the availability of aftermarket components can be helpful – a good example is the article on BMW diesel units, which discusses differences in performance, reliability, and maintenance costs. To better understand how to approach the selection of used parts and replacements in high-end vehicles, it is worth reading the material BMW N47 vs M57 / M57N / M57N2 – ranking of legendary diesels.