Audi A3 8V Q3 F3 TT 8S Wheel ABS Speed Sensor Rear Right O/S WHT003856C

Audi A3 8V Q3 F3 TT 8S ABS Wheel Speed Sensor Rear Right is a safety system component responsible for precisely reading the rotational speed of the rear right wheel. As part of the ABS Speed Sensor group, it collaborates with the brake system control module, enabling effective ABS operation and stable traction control. A used OEM component is a sensible choice for professional Audi vehicle repairs where structural compatibility and predictable performance are crucial.

Specifications and technical data

• SKU: WHT003856C
• Mark: Audi
• Condition: Used
• OEM Part Number: WHT003856C
• Substitutable numbers: WHT003856C, WHT 003 856 C
• Location on the vehicle: Rear, Right
• Category: ABS Speed Sensors

Purpose and Function in the Vehicle

The presented ABS wheel speed sensor is designed for installation on the rear axle, right side, in Audi vehicles of the A3 8V, Q3 F3, and TT 8S families. Its function is to generate a wheel rotational speed signal that is sent to the brake system controller. Based on this data, the ABS system can limit wheel slip during braking, and the stability control systems use it to correct vehicle behavior.

A correctly functioning sensor in this location is important for:

• maintaining vehicle stability during sudden braking,
• proper operation of the ABS system and related electronic systems,
• eliminating errors and warning lights associated with the braking system.

Advantages of Using an Original Audi Sensor

Choosing an original ABS wheel speed sensor for Audi translates to high repeatability of operating parameters and proper fit with the hub and electrical harness. Factory geometry and signal characteristics minimize the risk of compatibility issues that can arise with aftermarket parts of inconsistent specifications. This ensures that the ABS controller receives a signal with the appropriate amplitude and frequency, supporting the stable operation of the entire system.

Key benefits include:

• secure fit with the suspension structure and the rear right wheel hub,
• preservation of the original ABS system operating characteristics,
• reduction of the risk of repeat service interventions due to incorrect speed readings.

Installation and Operational Characteristics

The sensor is designed to operate in demanding conditions typical for the wheel area – exposed to moisture, dirt, and variable temperatures. Vehicle placement: rear – right side necessitates proper cable routing and correct seating in the hub or steering knuckle socket, in accordance with Audi's service procedure. During installation, it is recommended to:

• thoroughly clean the sensor socket of corrosion and dirt,
• check the condition of the pulse ring or toothed ring,
• inspect the electrical harness for chafing and insulation damage.

This approach allows for full utilization of the used component's potential and reduces the risk of the ABS fault recurring.

Selecting a Used ABS Sensor and Technical Aspects

When selecting an ABS wheel speed sensor for Audi, matching it to the specific model version and brake system configuration is crucial. In practice, this means verifying compatibility by manufacturer markings and comparing the construction with the removed part. Precise matching of a used sensor allows for the full functionality of safety systems without the need for costly purchase of a new part.

If you want to better understand how to safely use used electronic components in a car, including sensors and control modules, it's worth consulting the Global Parts guide: Used Automotive Electronics – A Guide to Selecting ECU Modules and Sensors. You will find practical tips on compatibility, diagnostics, and installation there.

Additionally, to gain a broader context on the use of original second-hand components, you can read the material: Why Used Original OEM Parts Are a Safe Choice, which discusses quality, safety, and cost-effectiveness of repairs using OEM parts.

System Expansion and Other Audi ABS Speed Sensors

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

This approach allows for maintaining consistent parameters across the entire system, which is particularly important in modern vehicles where safety systems are tightly integrated and react to the slightest deviations in signals from individual sensors.