Mercedes W204 Wheel ABS Speed Sensor Front Left Right N/O/S Cable A2049057900

The ABS Speed Sensor for Mercedes W204, Front Left/Right is an original safety system component responsible for precisely reading the rotational speed of the front wheels. This factory sensor works with the ABS system, stabilizing brake performance and supporting traction control, which translates to more predictable vehicle behavior. Thanks to the use of an original N/O/S cable with a signal harness, communication with the control module remains stable and resistant to interference.

Specifications and technical data

• SKU: A2049057900
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2049057900
• Substitutable numbers: A2049057900, A 204 905 79 00
• Location on the vehicle: Front, Left, Right
• Category: ABS Speed Sensors

Vehicle Application and Placement

The presented ABS speed sensor is designed for installation on the front axle, with the possibility of fitting on either the left or right side. This solution simplifies part selection and allows for flexible replacement depending on current service needs. Its placement near the front wheel ensures direct reading of the hub's rotational speed, which is crucial for the proper functioning of the anti-lock braking system.

Function in the ABS System and Benefits of Use

The ABS speed sensor is responsible for generating the signal based on which the brake system controller regulates pressure in the brake circuits. A properly functioning component:

• ensures stable ABS operation during hard braking,
• supports the operation of assistance systems such as traction control or stability control,
• reduces the risk of uneven braking of individual wheels,
• prevents ABS-related errors and warning messages.

Using an original sensor dedicated to Mercedes ensures the correct signal characteristics and compatibility with the factory control unit software.

Technical Specifications and Compatibility

The offered part belongs to the ABS Speed Sensor category and has been specifically designed for the Mercedes W204 platform. The integrated design with an N/O/S signal cable facilitates harness routing along the wheel arch and underbody, minimizing the risk of chafing and mechanical damage. The included connector is ready for direct connection to the factory electrical system, reducing the need for modifications.

Its original Mercedes origin helps maintain consistent electrical parameters, such as resistance and impulse signal characteristics. This ensures that the brake system controller receives data in a format compliant with factory specifications, which is particularly important for advanced safety systems.

Condition, Verification, and Service Application

This item is a used part, sourced from disassembly, offering an economical repair for the ABS system while maintaining original manufacturer specifications. This type of component is particularly useful in situations where:

• the vehicle displays errors related to front wheel speed readings,
• the ABS system operates unstably or disengages at low speeds,
• the cable or the sensor itself has been damaged due to corrosion, impact, or mechanical interference.

When selecting the correct sensor, it is advisable to refer to catalog data and manufacturer markings. If in doubt, comparing the old part with the offered one in terms of shape, cable length, and connector type can be helpful.

Practical Installation Tips and Additional Knowledge

During installation, it is recommended to thoroughly clean the knuckle socket and inspect the condition of the tone ring on the hub. Proper routing and secure fastening of the cable in its holders reduces the risk of future damage. It is also worth paying attention to the overall condition of drivetrain components and sensors, such as hubs, drive shafts, or differentials – this is described in more detail in our guide on selecting used differentials, sensors, and drivetrain components.

If you are looking for other components related to wheel speed measurement systems and braking systems, check out our offer in the section for dedicated ABS speed sensors for various models. This will help you more easily assemble a set of parts tailored to a specific car model.