Mercedes W212 CLS C218 Wheel ABS Speed Sensor Front Right O/S A2125400217

Mercedes W212 CLS C218 Wheel ABS Speed Sensor Front Right O/S is a precision safety system component responsible for accurate wheel speed reading and the proper operation of the ABS system. This component is designed for installation on the front right axle, ensuring stable performance of braking assistance and traction control systems in Mercedes vehicles. Thanks to its factory-spec design, the sensor interacts with the vehicle's electronics in a predictable and repeatable manner.

Specifications and technical data

• SKU: A2125400217
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2125400217
• Substitutable numbers: A2125400217, A 212 540 02 17
• Location on the vehicle: Front, Right
• Category: ABS Speed Sensors

Purpose and function of the ABS speed sensor

The ABS wheel speed sensor mounted on the front right side is responsible for generating a wheel speed signal, which is then analyzed by the anti-lock braking system controller. A properly functioning component:

• enables precise braking force distribution by the ABS system,
• supports vehicle stability during emergency braking,
• ensures the correct operation of systems linked to wheel speed readings (e.g., traction control, electronic stability programs – if present in the specific vehicle),
• reduces the risk of increased braking distance resulting from erroneous speed readings.

Placement on the vehicle in the front suspension area on the right side requires the use of a component with appropriately matched geometry and signal characteristics, making this sensor the right choice for dedicated Mercedes models.

Compatibility and integration with the braking system

The presented ABS speed sensor has been designed for full integration with the factory braking system and electronics of Mercedes W212 and CLS C218 series vehicles. Proper matching of connectors, cable length, and signal characteristics allows for:

• seamless connection to the existing electrical harness,
• stable cooperation with the ABS control module,
• maintenance of factory safety system performance parameters.

As a result, replacing a faulty sensor with this component allows for restoring the system's proper operation without the need for installation modifications or the use of adapters.

Performance characteristics and advantages of use

Choosing an ABS wheel speed sensor dedicated to a specific Mercedes model translates into a number of practical benefits. The most important include:

• Stable ABS system operation – a correct signal from the sensor reduces the risk of incorrect system interventions during braking.
• Consistency with factory electronics – the sensor's parameters are adapted to the controller's algorithms, which promotes predictable vehicle behavior.
• Proper mounting fit – the design, prepared for operation on the front right axle, facilitates installation in the intended mounting location.
• Possibility of computer diagnostics – a properly functioning sensor allows for reliable parameter reading in diagnostic testers.

For the user, this means higher confidence in the braking system's performance in emergency situations and a reduction in ABS errors related to incorrect wheel speed readings.

Component condition and service application

The offered ABS wheel speed sensor is an aftermarket component, which makes it an attractive service solution for repairing the braking system in older Mercedes vehicles. Such components are often chosen when:

• clearing ABS errors related to a lack of signal from a specific wheel,
• performing repairs after mechanical damage within the suspension area,
• diagnosing faults where it is necessary to swap the sensor for a functional unit.

A properly selected sensor allows for restoring system functionality without the need to invest in more expensive new components, while maintaining correct cooperation with the vehicle's electronics.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the braking area in your Mercedes and need other elements from the same group, such as additional sensors, signal cables, or mounting hardware, check the available parts in the Mercedes ABS speed sensor category.

When deciding to choose aftermarket components, it is worth knowing the broader context regarding electronics and measuring elements in the car – practical tips on how to responsibly use used modules and sensors can be found in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.