Walker 350-35034 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker Oxygen Sensor for Mercedes-Benz and BMW

Walker Products 350-35034 is a heated oxygen sensor built as a specific-fit OE replacement for select Mercedes-Benz and BMW applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control on upstream sensor locations.

For drivers searching for a Mercedes-Benz AMG GT 63 upstream right oxygen sensor, or a BMW X3 and 528i upstream sensor for cylinders 4-6, this Walker Products Aftermarket part number 350-35034 is matched to the listed vehicle and position applications.

Key Features

• Heated oxygen sensor for upstream exhaust monitoring
• Specific-fit design for the listed vehicle applications
• Threaded mounting type with 18.0 mm thread diameter
• 5-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific fitment
• Wiring harness length: 30.04 in.; overall length: 33.58 in.

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as OE replacement parts for a wide range of vehicles worldwide. Part number 350-35034 is built for the specified mounting position and wiring layout so the ECU receives the correct sensor feedback. Walker Products has supported engine management and fuel system applications since 1946 and operates under ISO 9001/TS 16949 certification standards.

This part cross-references common oxygen sensor applications used in Mercedes-Benz and BMW engine management systems for the same position and function.

What This Sensor Helps Address

• Check engine light or malfunction indicator light related to oxygen sensor faults
• Poor engine performance 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 vehicle year, make, model, and sensor position before ordering.
• Inspect the sensor wiring harness and connector for heat damage or physical wear before installation.
• Verify the threaded mounting location and connector orientation match the original sensor.
• Use the listed upstream position exactly as shown in the fitment data, including right-side and left-side applications where specified.

Quality Assurance

Walker Products manufactures this oxygen sensor as a specific OE-style replacement for the listed applications and backs its engine management product line with ISO 9001/TS 16949 certified manufacturing practices.