Delphi SS21251 ABS Wheel Speed Sensor - Front

Front ABS Wheel Speed Sensor for Nissan and Infiniti

Delphi SS21251 is a front ABS wheel speed sensor built for accurate wheel speed signal input on select Nissan and Infiniti vehicles. It is a direct-fit sensor for front applications on the 2004-2007 INFINITI QX56, 2005-2007 Nissan Armada, 2005-2007 Nissan TITAN, and 2004 Nissan Pathfinder Armada.

Delphi calibrates and validates its sensors to OE standards, helping maintain consistent readings for the ABS system. The SS21251 uses a rectangular connector with 2 terminals and a male connector design.

Key Features

• Part number: SS21251
• Front ABS wheel speed sensor
• Blade terminal type
• 1 connector, rectangular shape
• 2 terminals, female terminal gender
• Male connector gender
• No mounting hardware included
• No wiring harness included
• Package contents: ABS wheel speed sensor and instruction sheet

Detailed Description

Delphi SS21251 is engineered for front wheel speed monitoring in ABS-equipped vehicles. It is a practical replacement for the front ABS sensor on the Infiniti QX56, Nissan Armada, Nissan TITAN, and Nissan Pathfinder Armada when the original sensor is damaged, contaminated, or no longer sending a reliable signal. This part cross-references Standard Ignition ALS621 for the same application.

As part of Delphi’s sensor lineup, this ABS wheel speed sensor is developed and validated to OE standards to support accurate signal output. That matters for vehicles such as the Nissan Armada and Nissan TITAN, where the ABS module depends on clean wheel speed data to manage braking response.

What It Helps Solve

• ABS warning light caused by a failed front wheel speed sensor
• Erratic or missing wheel speed signal at the front axle
• ABS system fault codes related to front sensor input
• Brake control issues caused by contaminated or damaged sensor output
• Intermittent sensor readings on Nissan Armada, Nissan TITAN, and Infiniti QX56 applications

Installation Notes and Tips

Verify connector style, terminal count, and front position before installation. The SS21251 uses a rectangular 1-connector design with 2 terminals, so matching the original sensor configuration is important for proper fitment. Inspect the tone ring, hub area, and wiring path during replacement, and follow the included instruction sheet for installation steps.

Quality Assurance

Delphi tests and calibrates its sensors to OE standards and uses product validation methods during development. That focus on signal accuracy helps support dependable ABS operation and reduces the chance of repeat repairs.