ABS Sensor Mercedes W221 Brake Axle Suspension Rear Right O/S A2219050201

ABS Sensor Mercedes W221 Brake Axle Suspension Rear Right O/S is a safety system component responsible for precise rotational speed reading of the rear wheel on the right side. As an ABS speed sensor, it works in conjunction with the brake control module, enabling the effective operation of the anti-lock braking system. This used original component is a sensible choice for vehicle maintenance when you want to maintain the correct operating parameters of the system.

Specifications and technical data

• SKU: A2219050201
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2219050201
• Substitutable numbers: A2219050201, A 221 905 02 01, KZ
• Location on the vehicle: Rear, Right
• Category: ABS Speed Sensors

Purpose and function in the braking system

The presented sensor is designed for installation on the rear axle, right side, in W221 series models. Its task is to generate a wheel speed signal, which is sent to the ABS system controller. Based on this data, the system can limit the pressure in the brake circuit of a given wheel, preventing locking and improving vehicle stability during braking.

A properly functioning speed sensor has a direct impact on:

• the effectiveness of the ABS system in emergency braking situations,
• driving stability on surfaces with varying grip,
• the operation of related electronic systems, such as traction control or electronic stability control (if present in the vehicle).

Benefits of using an original ABS speed sensor

The original Mercedes ABS speed sensor ensures compatibility with the factory characteristics of the braking system. A properly selected component minimizes the risk of controller errors, warning lights illuminating, and uneven ABS system operation. By maintaining the correct signal parameters, it is possible to maintain predictable vehicle behavior during braking.

The most important advantages of using this type of component include:

• factory fitment to the electrical installation and wheel hub mounts,
• stable signal parameters under typical operating conditions,
• reduced risk of improper interaction with the vehicle's electronics.

Installation characteristics – rear, right side

The sensor is intended for installation in a specific location – on the rear axle, right side. This clear definition of location facilitates the selection of the correct element during service. Proper adjustment of the installation side is crucial for correct cable routing, proper seating in the socket, and avoiding mechanical stress during suspension operation.

When replacing, it is worth paying attention to:

• thorough cleaning of the mounting socket in the steering knuckle or hub,
• correct routing of the cable in the original clips,
• checking the condition of the electrical connector before connection.

Component condition and service application

The offered element comes from a group of used parts, which allows for economical repair while maintaining the manufacturer's original specifications. This type of solution is particularly beneficial for vehicles used intensively, where a reasonable balance between repair cost and maintaining the proper operation of safety systems is important.

Before installation, standard ABS system diagnostics are recommended to confirm that the cause of the fault is indeed the speed sensor, and not damage to the wiring harness, impulse ring, or controller.

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 additional sensors, signal cables, or mounting elements, check the available parts in the Mercedes ABS speed sensor category.

How to consciously choose used electronics and sensors

When selecting a used sensor, it is worth paying attention to compatibility with the braking system of a specific vehicle version and the parameters of the electrical installation. Tips on assessing the condition of automotive electronics and the principles of safe installation can be helpful. Practical advice can be found in the article Second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which discusses key aspects of choosing used electronic elements.

If you want to further organize the process of selecting parts and avoid mistakes when ordering components for your car, it is also worth reading the guide how to professionally select used car parts, saving time and nerves, where you will find practical tips on verifying compatibility and OEM markings.