Mercedes W907 Turn Angle Sensor Unit A9079000805

Description

Mercedes W907 Turn Angle Sensor Unit is a precision steering system component responsible for accurately reading the steering wheel position and interacting with vehicle stability control systems. As part of the Steering columns group, it ensures seamless integration between electronics and mechanics, resulting in predictable vehicle handling and proper operation of safety systems. This used OEM component is a sensible choice for professional repairs or replacing a faulty module in Mercedes vehicles.

Specifications and technical data

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

Function and role of the turn angle sensor

The turn angle sensor in Mercedes W907 models is responsible for continuous measurement of the steering wheel position relative to the vehicle’s driving axis. This information is utilized by, among others, the electronic stability control system, power steering systems, and other modules responsible for traction control and active safety.

A properly functioning sensor allows for:

• precise adjustment of steering assistance force to the current steering angle,
• stable operation of safety systems during sudden maneuvers,
• reduction of errors and fault messages related to the steering system.

Purpose and integration with the Steering column

The presented sensor is a component that works with the Steering column, mounted within its assembly and integrated with the vehicle’s electronics. Its design is adapted to the steering system architecture used in Mercedes W907 series vehicles, which facilitates installation and subsequent calibration at a service center.

Thanks to the factory fitment to the steering column:

• the correct steering angle reading geometry is maintained,
• electrical connections are compatible with the vehicle’s wiring harness,
• the risk of incompatibility with other control modules is minimized.

Characteristics of the used component

The offered sensor comes from disassembly and is classified as a used OEM component, meaning it was manufactured for the Mercedes brand and complies with factory quality standards. This type of part is often chosen as an economical alternative to a new unit, while maintaining the correct operating parameters within the steering system.

In practice, installing a used turn angle sensor allows for:

• restoring the correct operation of assistance and stability systems,
• reducing repair costs while maintaining original specifications,
• maintaining electronic consistency with other modules in the vehicle.

Professional use in service and diagnostics

Due to its function, the turn angle sensor is a crucial element in the diagnostic process for steering system faults. Replacing this component is recommended in the event of errors related to steering wheel position readings, calibration issues, or improper operation of stability control systems.

You can find more about the operating principles of the steering system, the role of the steering column, and typical failure symptoms in the article: Steering system and power steering – how it works and what fails?, which discusses diagnostics and examples of using used parts in an accessible way.

Related items from the Mercedes Steering columns group

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