Mercedes W204 Wheel ABS Speed Sensor Front Left Right Cable AMG A2049057902

The Mercedes W204 Wheel ABS Speed Sensor Front Left Right Cable AMG is a precision safety system component responsible for accurately reading the rotational speed of the front wheels. This sensor, complete with a wiring harness, is designed for installation on the front axle, on either the left or right side, ensuring stable operation of the ABS system and traction control in demanding road conditions.

Specifications and technical data

• SKU: A2049057902
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2049057902
• Substitutable numbers: A2049057902, A 204 905 79 02, BG
• Location on the vehicle: Front, Left, Right
• Category: ABS Speed Sensors

Application and vehicle placement

This ABS speed sensor is designed for use on the front axle of Mercedes vehicles, with the ability to be mounted on both the left and right sides. This solution simplifies part selection and allows for flexible replacement of a damaged component under a single reference. The sensor works with the pulse ring on the wheel hub, generating the signal necessary for the proper operation of the anti-lock braking system and electronic stability control systems.

Construction, cable, and operating parameters

The sensor is equipped with a dedicated signal cable that allows for a direct connection to the vehicle's electrical system. The harness used provides adequate flexibility and resistance to typical operating loads in the wheel arch – vibrations, temperature changes, and exposure to moisture. The connector design is adapted to the factory Mercedes installation, which promotes secure seating in the socket and stable signal transmission to the brake system controller.

As an original Mercedes component, the sensor is optimized for the electrical and mechanical characteristics of the specific W204 platform, which translates into repeatable wheel speed readings and correct cooperation with the factory control software.

Benefits of using an original ABS sensor

Using a dedicated ABS speed sensor in the braking system provides a number of practical benefits:

• maintaining the proper operation of the ABS and ESP systems during emergency braking and on slippery surfaces,
• consistency of signal parameters with the requirements of the brake controller,
• reducing the risk of errors in the controller's memory resulting from incorrect wheel speed readings,
• easier diagnostics in the event of faults, thanks to compliance with factory service procedures.

The element belongs to the ABS speed sensor group, which means it is directly related to driving safety and vehicle stability, especially in situations of sudden braking or variable grip.

Characteristics of the used product

The offered sensor is used, which in practice means it has been removed from a vehicle and verified for further serviceability. This type of part represents a reasonable compromise between repair costs and maintaining the manufacturer's original specifications. By choosing a used sensor, you can maintain the integrity of the braking system without having to resort to cheaper replacements with uncertain parameters.

Selection by OEM number and technical support

For the correct selection of an ABS speed sensor for a specific Mercedes model, it is crucial to use the OEM part number and vehicle data. If in doubt, it is worth using our guide on used electronics and sensors, which describes the principles of compatibility verification, selection by numbers, and practical installation examples: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

If you want to deepen your knowledge on how to select parts by OEM number and vehicle data, a practical step-by-step guide will also be helpful: how to choose the right car part by VIN and OEM number.

System expansion – other Mercedes ABS 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 rear axle sensors, additional signal harnesses, or mounting elements, check out the available parts in the Mercedes ABS speed sensor category.