Headlight Leveling Sensor Audi A4 B9 Q7 4M With Bracket Rear Right O/S 4M0907503

Headlight Leveling Sensor Audi A4 B9 Q7 4M With Bracket Rear Right O/S is a precision component of the Automatic headlight leveling system, responsible for the correct adjustment of the headlight beam relative to the vehicle's load. Mounted on the rear right axle, the sensor works with the vehicle's body electronics, ensuring stable, predictable, and safe road illumination in various driving conditions. This solution is particularly important in modern Audi models, where comfort and safety of night driving are a priority.

Specifications and technical data

• SKU: 4M0907503
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0907503
• Substitutable numbers: 4M0907503, 4M0 907 503
• Location on the vehicle: Rear, Right
• Category: Self-Levelling Suspension Parts

Function and application in the automatic headlight leveling system

The leveling sensor mounted on the rear right part of the suspension transmits information about the current position of the body relative to the axle to the suspension and headlight control unit. Based on this, the system automatically corrects the headlight tilt angle, reducing the risk of dazzling other road users and improving visibility in front of the vehicle.

In practice, this means that when the load changes – e.g., while driving with passengers in the back seat or with luggage – the headlights maintain a stable, predictable beam level. For the user of an Audi A4 B9 or Q7 4M, this translates into more comfortable, consistent lighting performance without the need for manual adjustment.

Compatibility and fitment for Audi

The presented sensor is a component designed for Audi vehicles equipped with a factory automatic headlight leveling system. The placement on the vehicle, specified as rear right, allows for precise matching of the component to the specific mounting point in the suspension.

Thanks to the use of original mounting geometry and the correct operating characteristics, the sensor works with the factory wiring and control units, which facilitates installation and reduces the risk of errors in the lighting system diagnostics. This is particularly important in vehicles equipped with advanced headlights, where correct data from the sensors is crucial for the proper operation of the entire system.

Performance characteristics and installation benefits

Replacing a faulty leveling sensor with a functional unit allows for restoring the proper operation of the automatic headlight leveling, eliminating common symptoms such as:

• incorrect headlight beam angle when the load changes,
• lighting system error messages on the instrument cluster,
• uneven road illumination during acceleration and braking.

By using a dedicated sensor for the rear right side of the suspension, you minimize the need for installation modifications and ensure the consistency of the entire system's operation. This is a beneficial solution both from a service perspective and for subsequent computer diagnostics.

Condition and practical aspects

The offered item belongs to the group of used parts, which allows for an economical repair of the automatic leveling system while maintaining the original component design. This type of solution is often chosen for vehicles used on a daily basis, where a reasonable balance between repair cost and maintaining factory functionality is important.

Before installation, it is recommended to follow standard service procedures, including checking the electrical harness, mounting points, and subsequent system adaptation in the control unit, in accordance with the procedures provided for the automatic headlight leveling system in Audi.

If you are planning a comprehensive repair or upgrade of the lighting area in your Audi and need other elements from the same group, such as leveling sensors, mounting elements, or components working with headlights, check the available parts in the Audi automatic headlight leveling category.

For drivers who are simultaneously analyzing the condition of the drivetrain and planning a transmission service, a guide describing typical faults and the selection of used components may be helpful – detailed information can be found in the article Transmission: manual, automatic, or DSG – typical faults and a guide to buying a used gearbox.