Mercedes W204 Wheel ABS Speed Sensor Front Left Right N/O/S Cable A2045400117

Mercedes W204 Front Left Right ABS Sensor is an original brake system component from the ABS speed sensor group, designed for installation on the front axle. Precise wheel speed reading supports stable ABS and traction control operation, improving driving safety in everyday and demanding conditions.

Specifications and technical data

• SKU: A2045400117
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045400117
• Substitutable numbers: A2045400117, A 204 540 01 17
• Location on the vehicle: Front, Left, Right
• Category: ABS Speed Sensors

Sensor Purpose and Function

The Mercedes W204 Front Left Right ABS Sensor works in direct conjunction with the tone ring and the brake system control module. Its function is to generate a wheel speed signal, which the controller uses to regulate brake circuit pressure during emergency braking and when traction is lost.

This component is designed for installation on the front axle, on either the left or right side, which simplifies part selection when servicing one or both wheels. A properly functioning sensor reduces the risk of extended braking distances, brake pedal pulsation, and malfunction of driver assistance systems.

Construction and Mounting Parameters

The sensor belongs to the ABS speed sensor category, meaning it is designed to operate in harsh conditions – near the wheel hub, where variable temperatures, moisture, and road debris are present. The housing and connector are constructed to ensure a stable connection with the wiring harness and proper positioning relative to the tone ring.

Its placement on the vehicle includes the front left and right sides, allowing one type of sensor to be used on both sides of the axle. This simplifies service logistics and speeds up the replacement process, especially when simultaneous inspection of both axle sensors is recommended.

Benefits of Using an Original Sensor

Using an original solution dedicated to a specific vehicle generation translates to:

• Stable cooperation with the factory ABS control unit – correct signal parameters and electrical compatibility.
• Proper geometric fit – the sensor is prepared for installation in the designated socket without requiring modifications.
• Consistency with other brake and drivetrain components – minimizing the risk of diagnostic errors.

For users considering the purchase of used parts within the drivetrain and ABS-related components, the following guide may be useful: check how to safely choose used differentials, sensors, and drivetrain components. It helps to better assess the condition of components and avoid common mistakes when selecting parts.

Condition and Service Application

The offered sensor is in used condition, making it an attractive cost-effective alternative while maintaining the functionality required for proper ABS system operation. This type of part is suitable for both immediate repairs after a single sensor failure and for more extensive brake system servicing when multiple components need replacement simultaneously.

Before installation, standard service procedures are recommended: check the knuckle socket, inspect the vehicle's wiring and connector, and verify any stored error codes in the control unit. Properly performed installation and diagnostics allow for full utilization of the sensor's potential and restoration of correct ABS system operation.

Summary

The Mercedes W204 Front Left Right ABS Sensor is a functional service solution for users seeking an original front axle wheel speed sensor. Its proper fit for the specific model, correct placement on the vehicle, and cooperation with the factory brake system make it a sensible choice for repairs related to ABS and stability control systems.