Facet 21.2122 ABS Wheel Speed Sensor

Overview of Facet ABS Wheel Speed Sensor 21.2122

The Facet ABS Wheel Speed Sensor 21.2122 is designed for precise wheel speed monitoring on select Audi models. This sensor ensures accurate data transmission to the ABS system, supporting vehicle safety and stability functions.

• Length of cable: 1040 mm for flexible installation
• Sensor length: 28 mm for compact fitment
• Resistance between terminals: 1650 ohm for reliable signal output
• Compatible with Audi A4, A4 Quattro, A6, A6 Quattro, S4, and S6 models
• Part number: 21.2122 for exact replacement

Technical Details and Specifications

The Facet ABS Wheel Speed Sensor 21.2122 features a 1040 mm cable length, providing sufficient reach for installation in various wheel hub configurations on Audi vehicles. The sensor itself measures 28 mm in length, allowing it to fit securely within the wheel assembly without interference. The electrical resistance between terminals is specified at 1650 ohms, ensuring consistent and accurate signal transmission to the vehicle’s ABS control module. This sensor is engineered to meet the precise requirements of Audi A4, A4 Quattro, A6, A6 Quattro, S4, and S6 models, making it a direct replacement part that maintains factory performance standards.

Compatible Audi Models and Applications

This ABS wheel speed sensor is compatible with the following Audi vehicles:

• Audi A4 and A4 Quattro
• Audi A6 and A6 Quattro
• Audi S4 and S6

Using the Facet 21.2122 sensor helps maintain the integrity of the ABS and traction control systems by providing accurate wheel speed data.

Common Issues Addressed by the Facet ABS Sensor

• Intermittent or no ABS warning light due to faulty sensor signals
• Erratic ABS or traction control system behavior
• Inaccurate wheel speed readings causing braking instability
• ABS system failure codes related to sensor resistance or connectivity
• Reduced vehicle stability during braking or cornering

Installation Notes and Tips

When installing the Facet ABS Wheel Speed Sensor 21.2122, ensure the sensor and cable are routed without sharp bends or pinching to avoid damage. Verify the electrical resistance matches the specified 1650 ohms before installation. Clean the sensor mounting area to ensure proper fit and signal accuracy. Use appropriate tools to secure the sensor firmly in place, and confirm connector terminals are free of corrosion or debris.

Quality Assurance and Warranty

Facet manufactures the 21.2122 ABS Wheel Speed Sensor to meet OEM specifications for fit, form, and function. Each sensor undergoes quality control testing to verify electrical resistance and mechanical integrity. While specific warranty details may vary, Facet products typically include a limited warranty against defects in materials and workmanship, supporting reliable performance for Audi A4, A6, S4, and S6 models.