Mercedes W907 Turn Angle Sensor Unit A9079000805

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W907 Turn Angle Sensor Unit is a high-precision electronic module designed to work with the steering system in vehicles of this series. This component is responsible for accurately reading the steering wheel position, which is crucial for the operation of stability control systems, power steering, and modern driver assistance features. By using an original Mercedes solution, you gain reliable compatibility, predictable performance, and stable operating parameters for your vehicle.

Specifications and technical data

• SKU: A9079000805-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A9079000805
• Substitutable numbers: A9079000805, A 907 900 08 05
• Category: Steering Columns

Purpose and function in the steering system

The offered sensor is an integral part of the Steering column assembly in Mercedes W907 series models. Its task is to continuously measure the steering wheel rotation angle and the speed of this rotation, and then transmit this data to the control units responsible for vehicle stability and power steering operation. A properly functioning module allows for:

• precise vehicle control across the full speed range,
• correct operation of safety systems based on steering wheel position readings,
• consistent operation of the steering system with the body electronics.

By using an original Mercedes solution, calibration consistency with factory control units is maintained, which reduces the risk of errors and fault messages in the vehicle's diagnostic system.

Benefits of using an original Mercedes module

For components such as the turn angle sensor, compatibility with vehicle software and the stability of measurement parameters are of key importance. Using an original Mercedes module within the steering column ensures:

• accurate steering wheel position reading throughout the entire operating range,
• proper cooperation with factory safety and comfort systems,
• reduced risk of issues during adaptation and calibration after installation.

This solution is particularly recommended for professional steering system repairs, where parameter repeatability and compliance with the manufacturer's service documentation are essential.

Component condition and service application

The offered turn angle sensor comes from the used parts group, which allows for economical repair while maintaining the manufacturer's original specifications. This type of component is often chosen in situations where:

• errors related to turn angle readings appear in computer diagnostics,
• irregularities occur in the operation of stability control systems,
• replacement of the component is necessary after mechanical damage to the steering column.

A properly selected module allows for restoring stable steering system operation without the need to interfere with other sub-assemblies, which shortens repair time and simplifies the service process.

Integration with the steering system and diagnostics

The turn angle sensor in the steering column works directly with the vehicle's electronics, therefore, after installation, it is recommended to perform adaptation procedures and tests using an appropriate diagnostic interface. A correctly performed configuration enables:

• checking the accuracy of the turn angle reading across the entire steering rotation range,
• verifying cooperation with power steering and stability systems,
• confirming the absence of errors in the control unit memory.

Thanks to this, the module can fully utilize its capabilities, ensuring consistent operation of the steering system with the vehicle's electronics in daily use.

If you are planning a comprehensive repair or upgrade of the steering system area in your Mercedes and need other components from the same group, such as housings, shafts, or additional column modules, check the available parts in the Mercedes Steering columns category.

To better understand the role of such modules in the vehicle and the dependencies between the turn angle sensor, steering column, and power steering system, it is worth reading the guide: Steering system and power steering – how it works and what fails?. The article discusses typical symptoms of failures, basics of diagnostics, and practical tips regarding the selection and replacement of steering system components.