Standard Ignition ALS538 ABS Wheel Speed Sensor - Rear, Rear Left or Rear Right

Overview of Standard Ignition ALS538 ABS Wheel Speed Sensor

The Standard Ignition ALS538 ABS Wheel Speed Sensor is designed specifically for Audi A4, A4 Quattro, and S4 models. This sensor plays a critical role in monitoring wheel speed to support your vehicle's anti-lock braking system (ABS) functionality.

• Terminal Quantity: 2
• Connector Gender: Female
• Terminal Gender: Male
• Connector Quantity: 1
• Connector Shape: Rectangular
• Hardware Included: No
• Harness Length: 55.5 inches (1410 mm)
• Mounting Location: Wheel
• Number of Bolt Holes: 1
• Terminal Type: Blade

Detailed Product Description

The ALS538 ABS Wheel Speed Sensor from Standard Ignition is engineered to provide accurate wheel speed data to the ABS control module in Audi A4, A4 Quattro, and S4 vehicles. Featuring a 55.5-inch harness length, this sensor offers sufficient reach for proper installation at the wheel mounting location. The sensor includes a single rectangular female connector with two terminals, designed to interface with male blade terminals for secure electrical connection. The single bolt hole mounting ensures a stable and precise fit, essential for reliable sensor performance. Note that this part does not include additional hardware, so original mounting bolts should be reused or sourced separately.

Common Applications and Issues Addressed

• Restores accurate wheel speed readings for ABS system functionality
• Resolves ABS warning light activation due to faulty sensor signals
• Improves traction control and stability system responsiveness
• Eliminates intermittent ABS engagement or braking irregularities
• Prevents diagnostic trouble codes related to wheel speed sensor faults

Installation Notes and Tips

• Ensure vehicle is securely lifted and wheel removed before installation
• Verify connector orientation matches the rectangular female design
• Inspect wiring harness for damage before connecting
• Use the original bolt or compatible hardware to secure the sensor at the wheel
• After installation, clear ABS codes and test drive to confirm proper operation

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The ALS538 ABS Wheel Speed Sensor undergoes rigorous quality control to ensure reliable performance in Audi A4, A4 Quattro, and S4 models. While specific warranty details may vary, Standard Ignition typically offers a limited warranty covering defects in material and workmanship.