Audi RSQ3 F3 Rear Height Level Sensor Headlight Levelling Left N/S 5Q0512521G

Audi RSQ3 F3 Rear Height Level Sensor Headlight Levelling Left N/S is a precision component of the beam height adjustment system, responsible for the proper operation of the automatic headlight levelling in your Audi. As part of the Front lights group, it works with the suspension system and body electronics to maintain a stable, safe, and compliant headlight beam angle. This used OEM component allows for a technically correct repair without the need for costly replacement of the entire system.

Specifications and technical data

• SKU: 5Q0512521G
• Mark: Audi
• Condition: Used
• OEM Part Number: 5Q0512521G
• Substitutable numbers: 5Q0512521G, 5Q0 512 521 G
• Location on the vehicle: Rear, Left
• Category: Headlight Assemblies

Function and role in the lighting system

The headlight levelling sensor mounted on the rear left side monitors the body position relative to the vehicle's axle and sends a signal to the headlight control unit. Based on this, the system automatically corrects the headlight setting, which is particularly important during:

• changes in vehicle load (passengers, luggage),
• dynamic maneuvers and braking,
• night driving using high-intensity lighting.

As a result, the correct beam angle is maintained, reducing glare for other drivers and improving visibility in front of the vehicle.

Purpose and fitment for Audi RSQ3 F3

The presented sensor has been designed for the Audi platform, taking into account the suspension geometry and the operating characteristics of the lighting system in the RSQ3 F3 model. This means:

• maintaining the factory logic of the automatic levelling operation,
• proper cooperation with the headlight control module,
• appropriate placement on the vehicle in the rear-left zone.

Such fitment allows for installation in accordance with the manufacturer's guidelines, without the need for modifications to the installation or suspension components.

Benefits of using an original sensor

Using an original levelling sensor in the Audi RSQ3 F3 translates into a number of practical operational benefits:

• Stable operation of the lighting system – reduction of dashboard errors related to headlight levelling.
• Better control over the light beam – especially important for high-intensity headlights.
• Consistency with the factory safety and driving comfort system.

The used OEM component is a reasonable compromise between repair cost and maintaining performance parameters close to factory specifications.

Placement on the vehicle and installation aspects

The sensor is intended for installation in the rear axle area on the left side, where it works with suspension components. When replacing, it is worth paying attention to:

• proper seating in the brackets and mounting points,
• correct connection of the electrical connector,
• checking the wiring for mechanical damage.

After installation, it is recommended to perform computer diagnostics and potential adaptation in the headlight control unit to ensure full functionality of the levelling system.

Condition and service application

The offered sensor is a used item, which makes it an attractive solution for service repairs when the priority is to restore system efficiency at controlled costs. It works well both when replacing a damaged sensor and in situations where periodic errors related to the operation of automatic headlight levelling occur.

If you are planning a comprehensive repair or upgrade of the front lighting zone in your Audi and need other components from the same group, such as headlights, control modules, or height adjusters, check the available parts in the Audi Front lights category.

For drivers interested in a broader approach to the operation and repair of electrical systems in a car, the guide article When is it worth replacing an alternator with a used one: a practical guide for drivers may be helpful, which shows how to consciously make decisions about using used parts in key vehicle systems.