Walker 350-34625 Oxygen Sensor - Upstream Left or Upstream Right

Walker 350-34625 Oxygen Sensor for BMW

Walker Products 350-34625 is a heated oxygen sensor built as a specific-fit OE-style replacement for select BMW applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring on the listed upstream positions.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for the listed BMW upstream left and upstream right locations
• 4-wire design with female connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 17.44 in.; overall length: 20.98 in.
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as replacement parts for original equipment applications. Part number 350-34625 is designed for select 1988-1994 BMW 750iL, 1991-1992 BMW 850i, and 1993-1994 BMW 850Ci models in upstream left and upstream right positions. This sensor supports ECU feedback for air-fuel control, helping the vehicle monitor exhaust conditions and maintain proper system operation.

Walker Products has supplied engine management components since 1946, and the brand line is centered on application-specific sensors for modern diagnostic systems. For BMW 750iL oxygen sensor replacement or BMW 850Ci upstream oxygen sensor service, 350-34625 is built around the listed fitment and connector specifications.

What This Sensor Helps Address

• Illuminated malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel correction
• Higher exhaust emissions from a degraded sensor signal
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

• Confirm the vehicle position before ordering: 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 style against the original sensor on the vehicle.
• Clear stored fault codes after installation and confirm proper ECU feedback during a road test.

Quality Assurance

Walker Products manufactures this sensor as a specific application replacement for the listed BMW fitments and builds it to support the diagnostic feedback required by the ECU. The brand operates under Automotive ISO9001/TS 16949 quality systems.