Mercedes W221 ABS Sensor Front Wheel Brake Wiring Cable Speed Sensor A2219055700

The Front Wheel ABS Speed Sensor for Mercedes W221 is a precise braking system component responsible for accurately reading wheel rotational speed and ensuring proper ABS system operation. This speed sensor wire works with the control module, stabilizing braking force and reducing the risk of wheel lock-up during sudden braking. A used genuine part is a sensible choice for servicing the braking system in premium vehicles like the Mercedes W221.

Specifications and technical data

• SKU: A2219055700
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2219055700
• Substitutable numbers: A2219055700, A 221 905 57 00
• Location on the vehicle: Front
• Category: ABS Speed Sensors

Function and Role of the ABS Speed Sensor

The front wheel ABS speed sensor with harness is responsible for generating a rotational speed signal that is sent to the braking system controller. Based on this data, the ABS system regulates brake circuit pressure, improving vehicle stability during braking on slippery surfaces and during sudden deceleration.

A functional front axle sensor is crucial for:

• maintaining the effectiveness of the ABS and braking assist systems,
• reducing braking distance in difficult conditions,
• minimizing brake pedal vibrations and pulsations resulting from incorrect readings,
• proper operation of related stability control systems.

Vehicle Application and Placement

The presented component belongs to the ABS Speed Sensor category and is designed for installation at the front of the vehicle. Its placement on the front axle requires proper wire routing and correct sensor positioning relative to the pulse ring to ensure a stable, interference-free signal.

When installing, pay attention to:

• correct routing of the harness in factory clips,
• protecting the wire from abrasion and contact with moving suspension components,
• secure connection of the plug to the vehicle's electrical system.

Benefits of Using a Genuine Mercedes Part

A genuine Mercedes ABS speed sensor ensures compatibility with the factory braking system characteristics and proper integration with the vehicle's electronics. This reduces the risk of control unit errors, ABS/ESP warning lights, and malfunction of safety systems.

The main advantages of using a genuine component include:

• stable wheel speed signal matched to the controller's algorithms,
• appropriate wire length and geometry for the front axle,
• factory connectors that minimize the risk of electrical contact issues.

Condition and Vehicle Service Application

The item is offered in used condition, allowing for economical ABS system repair while maintaining original manufacturer specifications. This type of sensor is suitable for replacing a damaged part as well as for diagnosing braking system issues when errors related to front wheel speed readings occur.

Sensor replacement is particularly recommended when:

• ABS or ESP error messages related to the front axle are present,
• uneven ABS system operation occurs during braking,
• mechanical damage to the wire or connector is visible during inspection.

If you are planning a comprehensive repair or upgrade of the braking area in your Mercedes and need other parts from the same group, such as speed sensors for other wheels, additional harnesses, or related installation components, check the available parts in the Mercedes ABS Speed Sensor category.

More Knowledge About Used Sensors and Drivetrains

When selecting a used ABS sensor, it's beneficial to know the typical signs of wear and methods for verifying the component's condition before installation. Practical tips for evaluating drivetrain and sensor-related components can be found in the guide Used Differentials – What You Should Know About Used Differentials, Sensors, and Drivetrains, which will help you make more informed service decisions.