Mercedes W213 C238 Rear Axle Wheel ABS Sensor Wiring Left N/S A2135403905

Mercedes W213 C238 Rear Axle Wheel ABS Sensor Wiring Left N/S is an original electrical component responsible for precisely transmitting signals from the wheel to the ABS module. Thanks to the proper routing of the wiring harness and perfectly matched connectors, it ensures stable operation of the anti-lock braking system and the correct functioning of safety systems. This solution is designed for users who expect compatibility with the factory installation and predictable vehicle behavior during braking.

Specifications and technical data

• SKU: A2135403905-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2135403905
• Substitutable numbers: A2135403905, A 213 540 39 05
• Location on the vehicle: Rear, Left
• Category: ABS Speed Sensors

Purpose and vehicle placement

The presented item is an ABS speed sensor wiring harness designed for the rear left side of the vehicle. It is mounted in the rear axle area, where it is responsible for transmitting the signal from the wheel sensor to the brake system controller. Correct placement on the vehicle is crucial for the accurate interpretation of wheel rotational speed and the operation of electronic stability control systems.

Being dedicated to specific models from the Mercedes W213 and C238 family allows for maintaining the correct cable routing, appropriate mounting points, and compatibility with factory brackets and covers. This minimizes the risk of abrasion, mechanical damage, and signal interference.

Function in the ABS system and vehicle electronics

The ABS speed sensor wiring harness is a component that connects the wheel sensor to the control electronics. It is responsible for:

• transmitting the wheel rotational speed signal to the ABS controller,
• cooperating with traction control and electronic stability control systems,
• maintaining proper signal quality thanks to the matched cable length and correct connectors.

A functional ABS sensor cable reduces the risk of errors appearing in the controller's memory, warning lights illuminating, and uneven brake system operation. Replacing a damaged harness with an original component from the same vehicle group allows for restoring proper communication within the braking system without the need for installation modifications.

Characteristics of the used component

The offered ABS speed sensor wiring harness comes from dismantling, which means it is an original Mercedes component factory-adapted to work with the braking system of the given model. A used component allows for maintaining compliance with factory electrical and mechanical parameters, while simultaneously providing an economical solution for repairing or replacing a damaged cable.

Choosing an original, used wiring harness is particularly beneficial where the following are important: connector fitment, correct cable length, compatibility with mounting brackets, and predictable behavior during long-term operation.

Why it is worth using a dedicated ABS sensor wiring harness

Using the correct ABS speed sensor wiring harness on the rear left axle in a Mercedes W213 / C238 allows you to:

• maintain the correct operation of the ABS and traction control system,
• reduce the risk of errors resulting from an incorrect signal from the wheel,
• preserve the factory cable routing and mounting points,
• avoid modifying the electrical installation and fitting universal solutions.

For workshops and private users, this means faster installation, a lower risk of post-repair issues, and greater confidence that the braking system will work with the vehicle's electronics according to the manufacturer's specifications.

If you are planning a comprehensive repair or upgrade of the braking system area in your Mercedes and need other components from the same group, such as wheel sensors, signal cables, or wiring routed along the rear axle, check the available parts in the Mercedes ABS speed sensor category.

To better plan work on the drivetrain and related sensors, it is worth using practical tips on assessing the condition of used components – you will find them in the article Second-hand differential – what you need to know about used differentials, sensors, and drivetrain systems.

If you want to expand your knowledge on the conscious choice of used electrical and mechanical components, the guide Used car parts: Myths and facts you need to know will also be helpful, as it clarifies the most common doubts related to the use of such subassemblies.