Walker 250-24395 Oxygen Sensor

OE Oxygen Sensor for Audi and Volkswagen

Walker Products OE 250-24395 is a specific-fit heated oxygen sensor built for select Audi and Volkswagen applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control, emissions monitoring, and fault detection.

Use this Walker Products OE oxygen sensor when servicing upstream sensor locations on Audi A4, A4 Quattro, A6, A6 Quattro, S4, S6, Allroad Quattro, and Volkswagen Passat models listed below.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with 22-gauge wiring
• 21.97 in. wiring harness length and 25.51 in. overall length
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific fitment

Product Details

Walker Products OE focuses on original-equipment-style replacement sensors for engine management systems. Part number 250-24395 is built for the correct position and connector style on the supported vehicles, helping maintain accurate exhaust gas feedback to the ECU. For Audi A4, A4 Quattro, A6, A6 Quattro, S4, S6, and Allroad Quattro applications, as well as Volkswagen Passat models, this sensor is listed for upstream front, upstream rear, upstream left, and upstream right positions depending on the vehicle.

This part cross-references no listed aftermarket part numbers for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate exhaust readings
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

• Confirm the exact position before ordering: upstream front, upstream rear, upstream left, or upstream right.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Verify thread size and connector shape against the original sensor on the vehicle.
• Clear diagnostic trouble codes after installation and confirm proper ECU feedback.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE replacement parts for global vehicle applications. The company is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946.