Mercedes-Benz C W204 Wheel Speed Sensor Rear Left Right RPM Cable A2045400317

Mercedes W204 Rear ABS Sensor Right Left is an original brake system component responsible for precisely measuring the rotational speed of the rear axle wheels. Thanks to its factory design, the sensor works with the ABS system, stabilizing brake performance and improving safety during emergency braking. This solution is intended for users who expect a proven part with maintained functionality.

Specifications and technical data

• SKU: A2045400317
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045400317
• Substitutable numbers: A2045400317, A 204 540 03 17
• Location on the vehicle: Rear, Right, Left
• Category: ABS Speed Sensors

Application and Vehicle Placement

The presented ABS speed sensor is designed for installation on the rear axle of the vehicle, with the possibility of installation on both the right and left sides. This solution simplifies part selection and allows for flexible use of the component in servicing the brake system of the Mercedes W204 class.

Thanks to its dedicated placement, the sensor works with the wheel's pulse ring, transmitting rotational speed signals to the ABS controller. A properly functioning component helps maintain vehicle stability during sudden braking and on surfaces with variable grip.

Technical and Functional Characteristics

The sensor belongs to the category of ABS speed sensors, meaning it is an integral part of the electronic brake assist system. The design is based on factory solutions used by the manufacturer, ensuring proper fit to the wheel hub, correct cable length, and a compatible electrical connector.

Key user features:

• dedicated application in the Mercedes W204 ABS system,
• operation on the rear axle with the possibility of mounting on both sides,
• adapted for cooperation with the factory brake system controller,
• maintenance of signal parameters required by the vehicle stabilization system.

This type of sensor is a component whose proper functioning directly impacts ABS operation, and indirectly also the operation of related systems such as traction control or lane keeping assist.

Benefits of Using an Original ABS Sensor

Using an original speed sensor in the Mercedes W204 helps reduce the risk of ABS system errors and incorrect wheel speed readings. Compared to random aftermarket replacements, the factory part ensures:

• correct mounting fit to the steering knuckle and wheel hub,
• a stable electrical signal compliant with controller requirements,
• a lower risk of error messages appearing on the dashboard,
• better cooperation with the vehicle's existing electrical system.

For the user, this means more predictable vehicle behavior during braking and a reduced need for repeated service interventions.

Part Condition and Practical Installation Aspects

The offered sensor is a used part, which in practice allows for combining an attractive purchase price with maintained factory design. This solution is particularly beneficial for repairs where both functionality and operational economy are important.

When replacing the ABS sensor, it is recommended to:

• thoroughly clean the mounting socket in the steering knuckle,
• check the condition of the vehicle's wiring and connector,
• verify the correct routing of the cable to avoid chafing.

After installation, it is advisable to perform a computer diagnostic to verify wheel speed readings and clear any stored errors in the controller.

Why Choose Used Electronics and Sensors?

For components like ABS speed sensors, choosing a proven used part can be a sensible alternative to new components. Proper selection by OEM number and compatibility with a specific vehicle version allows for full functionality at a lower service cost. You can find more practical information on this topic in the guide: why consider used ECU modules and sensors in modern cars.

Summary

Mercedes W204 Rear ABS Sensor Right Left is a factory brake system component designed for operation on the vehicle's rear axle. It is responsible for precise wheel speed measurement, which translates into effective ABS operation and stable vehicle behavior in emergency situations. Choosing an original, used sensor is a compromise between quality and cost, particularly beneficial for professional servicing of Mercedes W204 models.