Leveling Module Mercedes R171 Headlight Level Sensor Bi-Xenon Unit A0025428818

The Mercedes R171 Bi‑Xenon Headlight Leveling Module is a specialized control unit responsible for automatically adjusting the height of low and high beam headlights. It ensures stable operation of the xenon lighting system, improving visibility and driving comfort at night. This solution is designed for users who expect precise operation of the factory system in their Mercedes.

Specifications and technical data

• SKU: A0025428818
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025428818
• Substitutable numbers: A0025428818, A 002 542 88 18
• Category: Headlight Assemblies

Purpose and Function in the Headlight System

The leveling module works with the Bi‑Xenon headlights in the Mercedes R171, controlling their vertical position. Based on signals from body sensors, it corrects the beam angle to maintain the correct cutoff line and avoid dazzling other road users. This ensures that the Headlight system maintains stable operating parameters during acceleration, braking, and changes in vehicle load.

Technical Characteristics and Integration with the Electrical System

The control unit is an element of the vehicle's electronic system, communicating with other body modules. It is designed to work with factory Bi‑Xenon headlights, preserving the original lighting logic. The module's design allows for installation in the location designated by the manufacturer, using standard connectors and wiring harnesses.

As an original Mercedes component, the module ensures compliance with factory parameters, including the operating characteristics of leveling sensors and control algorithms. A correctly chosen part minimizes the risk of lighting system errors and warning messages on the instrument cluster.

Condition, Origin, and Service Application

The offered module is a used part, designated as an original used part. This type of component is particularly useful for leveling system repairs when the existing control unit has suffered electronic or mechanical damage. Using an original module from the same series helps maintain system consistency and facilitates diagnostics with factory service tools.

This solution is suitable for both standard replacement of a damaged controller and for restoring full functionality of Bi‑Xenon headlights after suspension or electrical system repairs.

Benefits of Using an Original Leveling Module

• Maintains correct headlight level with variable vehicle load.
• Improved nighttime visibility due to a stable cutoff line from Bi‑Xenon headlights.
• Seamless integration with the factory Mercedes electronic system.
• Reduced risk of lighting system errors after controller replacement.

For users who wish to maintain the factory lighting performance characteristics, using an original leveling module is the closest solution to the vehicle's original configuration.

Expanding the Mercedes Headlight System

If you are planning a comprehensive repair or upgrade of the front lighting area in your Mercedes and require other parts from the same group, such as headlights, adjustment motors, or additional control modules, check the available parts in the Mercedes Headlights category.

To better understand the relationships between drivetrain operation, vehicle load, and suspension and lighting behavior, it is worth reading the practical guide: Used Drive Axles and Differentials – How to Choose Gear Ratios for Your Driving Style.