Facet 21.2122 ABS Wheel Speed Sensor

Facet 21.2122 ABS Wheel Speed Sensor

Facet 21.2122 is an ABS wheel speed sensor for select Audi A4, A4 Quattro, S4, A6, A6 Quattro, and S6 applications. It uses a 1040 mm cable, a 28 mm sensor length, and 1650 Ohm resistance between terminals to match the electrical and physical requirements of the original-style setup.

Key Features

• ABS wheel speed sensor for brake system signal monitoring
• 1040 mm cable length for the listed Audi fitments
• 28 mm sensor length for OE-style mounting dimensions
• 1650 Ohm resistance between terminals
• Cross-references Audi and Volkswagen part number 4B0927803B
• Facet part number 21.2122 for catalog matching and service lookup

Fitment Details

• Fits 2002-2004 Audi A6, N/A, to VIN # 4B-2-200000
• Fits 2000-2004 Audi A6 Quattro, N/A, to VIN # 4B-2-200000
• Fits 2002-2003 Audi S6, N/A, to VIN # 4B-2-200000
• Fits 2000-2002 Audi A4, N/A, from VIN # 8D-X-200001
• Fits 2001-2002 Audi A4 Quattro, N/A, from VIN # 8D-X-200001
• Fits 2000-2002 Audi S4, N/A, from VIN # 8D-X-200001
• Fits 2000 Audi A4 Quattro, N/A

Detailed Description

This ABS wheel speed sensor is built for vehicles that rely on accurate wheel speed input for anti-lock brake system operation. Facet 21.2122 is specified with a 1040 mm lead, a compact 28 mm sensor body, and 1650 Ohm resistance, making it a direct-spec replacement for the listed Audi platforms. This part cross-references Audi and Volkswagen part number 4B0927803B for the same application. Use Facet 21.2122 when servicing Audi A4, A4 Quattro, S4, A6, A6 Quattro, or S6 models within the VIN ranges shown.

Common Issues This Part Addresses

• ABS warning light caused by a failed wheel speed sensor
• Erratic or missing wheel speed signal to the ABS module
• Brake system fault codes related to wheel speed input
• Intermittent ABS operation during braking events
• Sensor circuit resistance outside the specified range

Installation Notes and Tips

Verify the VIN breakpoints before ordering, since the listed Audi applications change by chassis range. Compare the original sensor length, cable length, and terminal resistance to confirm match before installation. Inspect the harness routing and connector condition during service, and clear ABS fault codes after replacement to confirm the system reads wheel speed correctly.

Quality Assurance

Facet manufactures electrical and sensor components for automotive service applications, and this part is cataloged to the OE-style reference 4B0927803B for the listed Audi and Volkswagen applications. Confirm fitment against the vehicle VIN and original sensor specifications before installation.