Walker 350-34139 Oxygen Sensor - Upstream Left or Upstream Right

Overview of Walker 350-34139 Oxygen Sensor for BMW Models

The Walker 350-34139 oxygen sensor is designed specifically for select BMW vehicles, including the 530i, 540i, 740i, 740iL, and 840Ci models. This heated oxygen sensor ensures accurate emissions monitoring and optimal engine performance by providing precise air-fuel mixture data to the engine control unit.

• Heated oxygen sensor with 4-wire configuration
• Specific fit for BMW 530i, 540i, 740i, 740iL, and 840Ci
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for secure connection
• Wiring harness length of 11.73 inches and overall length of 15.28 inches
• Wire gauge measurement of 20 for reliable signal transmission

Detailed Product Features and Specifications

This Walker oxygen sensor (part number 350-34139) is a heated sensor designed to provide faster response times and improved emissions control compared to unheated sensors. The 4-wire design includes two wires for the heating element and two for the sensor signal, ensuring consistent operation under various engine conditions. The sensor’s threaded mounting type with an 18.0 mm diameter allows for secure installation in the exhaust system. The radiused polygon male connector ensures a precise and stable electrical connection, reducing the risk of signal loss or corrosion.

The wiring harness length of 11.73 inches and overall length of 15.28 inches are optimized for the specific routing requirements of the compatible BMW models. The 20-gauge wire measurement supports durability and reliable signal integrity over time.

Walker Products Aftermarket Line Information

The Walker Products Aftermarket line focuses on providing replacement emission control components that meet or exceed OEM specifications. This oxygen sensor is part of that line, offering a direct fit and function for the specified BMW models. The product line emphasizes quality materials and precise manufacturing to maintain vehicle emissions compliance and engine efficiency.

Common Applications and Issues Addressed

• Replacement for faulty or failing oxygen sensors in BMW 530i, 540i, 740i, 740iL, and 840Ci
• Helps resolve engine performance issues related to incorrect air-fuel mixture readings
• Reduces emissions by ensuring accurate sensor data to the engine control unit
• Prevents check engine light triggers caused by sensor malfunctions
• Improves fuel economy by maintaining proper combustion control

Installation Notes and Tips

• Ensure the vehicle is cool before sensor removal to avoid burns
• Use appropriate oxygen sensor socket or wrench for removal and installation
• Verify connector type matches the vehicle harness before installation
• Apply anti-seize compound on sensor threads if not pre-coated
• Check for proper torque specifications to avoid sensor damage

Quality Assurance and Warranty

Walker oxygen sensors, including part number 350-34139, are manufactured to meet strict quality standards for durability and performance. While specific warranty details may vary, Walker Products Aftermarket components typically come with a limited warranty covering defects in materials and workmanship. This ensures reliability and peace of mind when replacing emission control sensors on your BMW 530i, 540i, 740i, 740iL, or 840Ci.