Audi A3 8P Wheel Speed ABS Sensor Rear Left N/S WHT003859

The Audi A3 8P Wheel Speed ABS Sensor Rear Left N/S is a component responsible for the precise reading of wheel rotation speed and the proper operation of the anti-lock braking system. This original Audi component, mounted on the rear left axle, ensures stable cooperation with the vehicle's factory electronics, which translates into predictable performance of the ABS and traction control systems.

Specifications and technical data

• SKU: WHT003859
• Mark: Audi
• Condition: Used
• OEM Part Number: WHT003859
• Substitutable numbers: WHT003859, WHT 003 859
• Location on the vehicle: Rear, Left
• Category: ABS Speed Sensors

Purpose and function in the braking system

The presented wheel speed sensor belongs to the Audi A3 8P Wheel Speed ABS Sensor Rear Left N/S category and is designed for installation on the rear left side of the vehicle. Its task is to generate a wheel rotation speed signal, which the ABS controller uses for:

• preventing wheel lock-up during heavy braking,
• stabilizing the vehicle's path in emergency situations,
• cooperating with traction control and electronic stability control systems,
• precise distribution of braking force on individual wheels.

The placement on the rear left axle is crucial for the proper operation of the entire system – an incorrect reading from one wheel can cause system errors, increased braking distance, or warning lights appearing on the instrument cluster.

Compatibility and fitment for Audi A3 8P

The Audi A3 8P Wheel Speed ABS Sensor Rear Left N/S has been designed as a part compliant with the manufacturer's factory requirements. Thanks to this:

• it fits the intended mounting point on the rear axle beam or steering knuckle,
• it works with the original wiring harness and installation connector,
• it provides the correct signal parameters for the ABS system controller.

Such fitment reduces the risk of compatibility issues that may occur when using replacements with uncertain electrical or mechanical parameters.

Characteristics of the used component

The offered sensor is a second-hand market item, which allows for reducing repair costs while maintaining the original manufacturer's specifications. A used component of this type is particularly attractive in situations where:

• a quick replacement of a damaged sensor is necessary after an ABS failure,
• you are repairing the vehicle on a reasonable budget while maintaining OEM parts,
• you want to avoid experimenting with cheap replacements of unverified quality.

A properly selected wheel speed sensor allows for restoring the correct operation of the braking system without interfering with other components.

The importance of correct ABS sensor selection

Selecting the right wheel speed sensor has a direct impact on driving safety. An improper element can cause:

• malfunction of ABS and stability systems,
• false errors stored in the controller's memory,
• uneven brake operation on individual wheels.

To consciously approach the purchase of used braking system components, it is worth familiarizing yourself with the practical tips contained in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?, where you will find a checklist helpful in assessing the condition and selecting such components.

Expansion and service of the ABS system in Audi

If you are planning a comprehensive repair or upgrade of the braking zone in your Audi and need other elements from the same group, such as additional wheel sensors, signal cables, or mounting elements, check the available parts in the Audi ABS Speed Sensor category.

Thanks to the use of consistent components from one product group, it is easier to maintain uniform system operation, simplify diagnostics, and reduce the risk of accidental faults resulting from mixing different manufacturing standards.