Speed Sensor Mercedes W203 W209 Rear Left N/S Wheel Brake ABS Cable A2035401317

Mercedes W203 W209 ABS Sensor Left Rear is an original brake system component designed for precise wheel speed measurement. As part of the ABS speed sensor category, it ensures stable cooperation with the factory ABS and traction control system, supporting safe braking in daily use. This is a solution for users looking for a proven, factory part for the rear axle on the driver's side.

Specifications and technical data

• SKU: A2035401317
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2035401317
• Substitutable numbers: A2035401317, A 203 540 13 17
• Location on the vehicle: Rear, Left
• Category: ABS Speed Sensors

Purpose and Function of the ABS Sensor

The rear left ABS sensor for Mercedes W203 and W209 is responsible for reading the rotational speed of the rear left wheel and transmitting the signal to the brake system controller. A properly functioning sensor enables:

• precise modulation of braking force by the ABS system,
• stable operation of assistance systems (e.g., traction control),
• reduction of brake pedal vibrations and pulsations during emergency braking,
• maintenance of predictable vehicle behavior on slippery surfaces.

Its location on the vehicle is the rear axle on the left side, which simplifies selecting the correct part for replacement.

Compatibility and Fit for Mercedes W203 / W209

The sensor is specifically designed for the Mercedes C-Class W203 and CLK W209 platforms, ensuring factory-standard ABS system performance. Proper geometric and electrical fit allows for installation in place of the original component without the need for wiring modifications.

For certainty in selection, it is recommended to verify by OEM number or vehicle VIN. Detailed guidance on selecting used sensors and electronic modules can be found in the guide: how to safely choose used sensors and electronic modules for your car.

Performance Characteristics and Advantages of OEM Solutions

As a component from the Mercedes offering, the ABS sensor maintains factory signal parameters, which is crucial for the correct operation of the brake controller. In practice, this means:

• stable wheel speed reading across the full range of driving speeds,
• compatibility with the ABS controller software used in the specific model,
• no need for adaptation or programming after installation (with correct part selection),
• preservation of the original performance characteristics of safety systems.

A used OEM part is a sensible compromise between cost and quality – especially for older Mercedes generations where both reliability and repair economy are important.

Condition, Verification, and Preparation for Installation

The sensor is categorized as used original parts, meaning it comes from a vehicle disassembly and has been verified for its suitability for further use. Such components are often chosen by workshops and individual users who expect factory fit without the cost of a new part.

Before installation, it is recommended to:

• check the vehicle's socket and wiring harness for corrosion and damage,
• clean the mounting socket in the steering knuckle or hub,
• inspect the pulse ring (if separate) for dirt and mechanical damage.

Why Choose a Used ABS Speed Sensor

Choosing a used ABS sensor for Mercedes W203 / W209 is a practical solution for drivers who want to maintain the functionality of their braking system at a reasonable service cost. Original parts from disassembly often offer:

• factory fit to the electrical and mechanical installation,
• compatibility with the existing ABS controller,
• a favorable price-to-durability ratio compared to cheap aftermarket alternatives.

If you are considering a broader replacement of electronic components in your car, it is worth reading the guide: why used automotive electronics – including ABS sensors – can be a cost-effective choice, where you will find practical tips on selection, compatibility, and installation.