Smart Fortwo C451 ABS Rotational Speed Sensor Rear Right O/S A4515400117

Smart Fortwo C451 ABS Rotational Speed Sensor Rear Right O/S is a safety system component responsible for precise wheel speed reading and the proper operation of the ABS system on the rear right axle. Thanks to its factory origin from the Smart brand, the sensor ensures a perfect fit for the electrical installation and correct cooperation with the vehicle's electronics, which translates into stable performance of the braking assistance systems.

Specifications and technical data

• SKU: A4515400117
• Mark: Smart
• Condition: Used
• OEM Part Number: A4515400117
• Substitutable numbers: A4515400117, A 451 540 01 17
• Location on the vehicle: Rear, Right
• Category: ABS Speed Sensors

Purpose and function in the ABS system

The presented item from the ABS Speed Sensor category is designed for installation on the rear right side of the vehicle. Its task is to generate a wheel rotational speed signal, which is then sent to the brake system controller. Based on this data, the ABS system can modulate pressure in the brake circuit, limiting wheel locking during emergency braking and improving driving stability.

A properly functioning speed sensor on the rear right axle is important for:

• maintaining the effectiveness of the ABS across the full speed range,
• proper operation of electronic stability control systems, if present in the vehicle,
• even distribution of braking force between the axles.

Compatibility and fit for Smart Fortwo C451

Smart Fortwo C451 ABS Rotational Speed Sensor Rear Right O/S has been designed with the specific suspension geometry and wiring harness of this model in mind. The correct placement on the vehicle (rear – right side) allows for proper cable routing, correct connector positioning, and seamless connection to the vehicle's installation without the need for modifications.

The original origin from the Smart brand helps maintain the factory operating parameters of the braking system and minimizes the risk of diagnostic errors related to an incorrect signal from the sensor. This solution is particularly beneficial for repairs where maintaining compliance with the manufacturer's service documentation is a priority.

Characteristics of the used component

The offered sensor is a used item, which in practice means it comes from dismantling and has been verified for suitability for further use. Such components are frequently chosen for vehicle maintenance where a reasonable balance between repair costs and maintaining the original system specification is important.

In the case of ABS speed sensors, it is essential to maintain adequate signal quality and proper operation across the full range of temperatures and rotational speeds. Choosing an original Smart component, even in a used version, allows for reducing the risk of compatibility issues that may occur with aftermarket parts of inconsistent parameters.

Benefits of using an original ABS sensor

Using this sensor in a Smart Fortwo C451 brings a number of practical benefits:

• preservation of the factory operating characteristics of the ABS system on the rear right axle,
• secure fit to mounts and the electrical harness without additional adaptations,
• reduced risk of error codes in the controller memory related to an incorrect speed signal,
• possibility of an economical repair while maintaining the original design of the braking system.

For users who care about maintaining the consistency of technical solutions in their vehicle, choosing an original Smart ABS speed sensor is a reasonable alternative to random aftermarket replacements.

System expansion and selection of other Smart ABS sensors

If you are planning a comprehensive repair or upgrade of the braking zone in your Smart and need other elements from the same group, such as additional speed sensors for other wheels, signal cables, or related system components, check the available parts in the Smart ABS Speed Sensor category.

Used electronics and sensors – practical tips

When choosing used electronic components, such as sensors in safety systems, it is worth being guided by a verified origin and compliance with the vehicle's factory specification. If you want to better understand when used electronic components are a good solution and how to approach their selection consciously, see the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?