Walker 250-25120 Oxygen Sensor - Upstream or Upstream Left

Overview of Walker Products OE Oxygen Sensor 250-25120

The Walker Products OE Oxygen Sensor 250-25120 is designed specifically for select Audi, Porsche, and Volkswagen models. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data to the vehicle’s engine management system.

• Heated sensor type for faster response times
• Specific fit for Audi A4, A4 allroad, A4 Quattro, A6, A6 Quattro, Porsche Macan, Volkswagen Beetle and Jetta
• 12.79-inch wiring harness length with 5 wires of 20 gauge
• Radiused polygon male connector for secure connection
• Threaded mounting type with 18.0 mm thread diameter
• Overall length of 18.11 inches for proper installation depth

Detailed Product Description

This oxygen sensor from Walker Products OE is engineered to meet the exact specifications of the original equipment for compatible vehicles. The heated sensor element allows for quicker activation, reducing emissions during cold starts. The 5-wire configuration with 20 gauge wiring ensures reliable signal transmission and durability. The radiused polygon male connector provides a secure and precise fit, minimizing the risk of connection issues. With a threaded mounting type and an 18.0 mm thread diameter, installation aligns with factory standards. The wiring harness length of 12.79 inches and overall length of 18.11 inches are designed to fit the engine bay layout of Audi A4, A6, Porsche Macan, and Volkswagen Beetle and Jetta models.

Walker Products OE Brand Line Information

The Walker Products OE line focuses on delivering emission control components that match original equipment specifications. This ensures compatibility and performance consistency for vehicles requiring precise sensor operation. The 250-25120 oxygen sensor is part of this line, providing a direct replacement solution for specific Audi, Porsche, and Volkswagen models, maintaining factory-level emissions control and engine efficiency.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for engine control units
• Helps resolve check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency by ensuring proper combustion
• Reduces harmful emissions by maintaining correct sensor feedback
• Prevents drivability issues such as rough idling or hesitation

Installation Notes and Tips

Ensure the vehicle is cool before beginning installation to avoid burns. Disconnect the battery to prevent electrical shorts. Use the correct tools to remove the old sensor and avoid damaging the threaded mounting hole. Verify the connector type matches the vehicle harness before installation. After installation, clear any diagnostic trouble codes and perform a test drive to confirm proper sensor operation.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet or exceed OEM standards for durability and performance. While specific warranty details for part number 250-25120 should be confirmed at the point of purchase, Walker typically offers coverage against defects in materials and workmanship to ensure reliability in emission control applications.