Mercedes W447 Front Wheel ABS Speed Sensor A4479057002

Mercedes W447 Front Wheel ABS Speed Sensor is an original safety system component responsible for the precise reading of the front wheel rotational speed. This ABS speed sensor category component works with the brake control module, supporting vehicle stability and braking efficiency. Thanks to its factory fit for Mercedes W447 series models, it ensures proper integration with the electrical installation and the ABS system.

Specifications and technical data

• SKU: A4479057002
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4479057002
• Substitutable numbers: A4479057002, A 447 905 70 02, A4479059401, A 447 905 94 01
• Location on the vehicle: Front
• Category: ABS Speed Sensors

Function and role of the ABS speed sensor

The front wheel speed sensor in the Mercedes W447 monitors the wheel's rotational speed and transmits a signal to the ABS controller. Based on this, the braking system can limit slippage, stabilize the vehicle's path, and support the operation of related systems, such as traction control or electronic stability control. A properly functioning sensor helps avoid electronic errors, ABS/ESP warning lights, and increased braking distances on slippery surfaces.

Purpose and vehicle placement

The presented item is designed for installation on the front axle of Mercedes W447 vehicles. Its placement on the vehicle has been factory-optimized for protection against dirt and mechanical damage, while maintaining the correct distance from the impulse ring. As a result, the sensor can generate a stable signal, undisturbed by suspension vibrations or temperature changes during operation.

Benefits of using an original Mercedes sensor

Using an original ABS speed sensor in a Mercedes W447 primarily ensures compatibility with the electrical installation and controller software. The appropriate signal characteristics, correct resistance, and matched mounting geometry reduce the risk of calibration issues and the need for additional modifications. This solution is particularly beneficial for professional brake system repairs, where parameter repeatability and predictable system behavior are essential.

Condition, origin, and service application

The offered sensor is a used part, sourced from vehicle dismantling, which allows for an economical repair of the ABS system while maintaining the manufacturer's original specifications. Such components are frequently used in specialized workshops servicing Mercedes vehicles, where combining reasonable costs with the preservation of the factory brake system design is important. The sensor is suitable for both replacing a damaged component and diagnosing ABS electronics issues.

Expanding knowledge about used electronics and measuring elements

When selecting used electronic components, such as speed sensors, it is worth knowing the basic principles of verification and matching to a specific vehicle model. Practical tips on choosing used controllers, modules, and sensors can be found in the article: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other elements from the same group, such as additional sensors, signal cables, or sensor mounts, check the available parts in the Mercedes ABS speed sensor category.