Mercedes C216 W221 Rear ABS Wheel Speed Sensor A2215400917

The Mercedes C216 W221 Rear Wheel Speed ABS Sensor is an original brake system component responsible for precisely reading the rotational speed of the rear wheel. Thanks to it, the ABS system can effectively stabilize the vehicle during braking, providing the driver with greater control and driving safety. This solution is dedicated to premium class models where reliability, compatibility with vehicle electronics, and proper cooperation with the factory controller are crucial.

Specifications and technical data

• SKU: A2215400917
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2215400917
• Substitutable numbers: A2215400917, A 221 540 09 17
• Location on the vehicle: Rear
• Category: ABS Speed Sensors

Function and Role of the Rear Wheel Speed ABS Sensor

The ABS speed sensor mounted on the rear axle is responsible for continuously measuring the wheel's rotational speed and transmitting the signal to the brake system control module. Based on this data, the ABS system can:

• limit wheel lock-up during sudden braking,
• stabilize the vehicle's path in emergency situations,
• support the operation of related systems, such as traction control or stability control.

A functional sensor at the rear of the vehicle is particularly important in premium cars, where the braking system interacts with extensive electronics monitoring the car's behavior on the road.

Compatibility and Fit for the ABS System

The ABS speed sensor designed for C216 and W221 body styles has been engineered to work with the factory Mercedes brake system and electronics. Proper matching of electrical parameters and signal characteristics helps avoid controller errors, ABS/ESP warning lights, and uneven system operation.

The component is installed at the rear of the vehicle, in close proximity to the wheel hub, allowing for precise rotational speed reading. A correctly selected sensor reduces the risk of system interference and ensures stable operation of active safety systems.

Characteristics of a Used Component

The offered sensor is a used part, sourced from dismantling. Such components are often chosen for servicing premium vehicles as they allow for maintaining the original system specifications while optimizing repair costs. For ABS sensors, it is particularly important that they come from the same design family as the factory-installed elements, which promotes correct cooperation with the vehicle's electronics.

Choosing an original, used sensor for a Mercedes is often a beneficial solution compared to random aftermarket replacements with uncertain parameters, which can generate system errors or shorten the lifespan of the entire system.

Why Choose an Original ABS Sensor for Mercedes

Using a dedicated wheel speed sensor at the rear of the vehicle translates to:

• compatibility with the factory software of the ABS controller and related systems,
• stable operation of the braking system across a wide range of speeds,
• a lower risk of errors and warning lights appearing on the dashboard,
• maintaining braking characteristics consistent with the vehicle manufacturer's design.

This is especially important in luxury models, where the braking system is integrated with numerous driving assistance systems, and each component must operate under strictly defined conditions.

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

Practical Tips for Choosing Used Sensors and Drivetrain Components

When selecting a used wheel speed sensor, it is worth paying attention to its compatibility with the specific vehicle body style and drivetrain. It is also important that the component is matched to the rear axle configuration, which affects the correct interpretation of the signal by the controller.

If you want to better understand how to safely purchase used components related to the drivetrain and measurement electronics, our blog post will be helpful: Used Differentials – What You Should Know About Used Differentials, Sensors, and Drivetrain Systems. There you will find practical tips on assessing the condition of parts, recognizing signs of wear, and making informed choices for specific car models.