Walker 250-25007 Oxygen Sensor

Walker OE Oxygen Sensor for Audi, Porsche, and Volkswagen

Walker Products OE 250-25007 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Audi, Porsche, and Volkswagen applications. It is built for upstream placement and provides the ECU with the feedback needed for accurate fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for the listed vehicle applications
• Threaded mounting with 18.0 mm thread diameter
• 5-wire design with 20-gauge wiring
• Radiused polygon male connector for proper harness connection
• Wiring harness length: 31.02 in.; overall length: 34.57 in.

Product Details

Walker Products OE 250-25007 is designed for upstream oxygen sensor locations on select 2002-2009 Audi A4, A4 Quattro, A6, A6 Quattro, Allroad Quattro, S4, TT Quattro, and A8 Quattro models, plus Porsche Cayenne and Volkswagen Passat, Phaeton, and Touareg applications. This part number is built for the specified position and engine-management feedback requirements, making it a direct replacement choice for vehicles that rely on precise air-fuel monitoring. Walker Products OE 250-25007 is part of the Walker Products OE line, which focuses on application-specific engine management components for modern import vehicles.

This part cross-references Bosch 15717 and Denso 234-9005 for the same application.

What It Helps Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

• Confirm the exact upstream position before installation: left, right, or front, depending on the vehicle.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement.
• Verify thread size and connector shape against the original sensor to ensure proper fitment.
• Use the vehicle’s fault codes and service information to confirm the failed sensor location before replacing parts.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and manufactures this sensor as an OE-style replacement for the listed applications. The company is ISO 9001/TS 16949 certified, supporting consistent manufacturing and application-specific fitment.