Walker 350-34295 Oxygen Sensor - Downstream

Walker 350-34295 Oxygen Sensor for BMW Z3

Walker Products 350-34295 is a heated oxygen sensor built as a specific-fit OE-style replacement for select 1998-2000 BMW Z3 downstream applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Specific-fit heated oxygen sensor for downstream placement
• 4-wire design with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 26.3 in; wiring harness length: 22.76 in
• Walker Products Aftermarket part number 350-34295

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed for OE replacement use. Part number 350-34295 is built for the correct fitment position and diagnostic feedback expected by the vehicle ECU. For BMW Z3 models, this downstream oxygen sensor is listed for cylinders 1-3 and cylinders 4-6 applications, depending on the vehicle configuration.

Compatible With 1998-2000 BMW Z3, downstream. This part number, 350-34295, is a direct-fit option for BMW Z3 downstream oxygen sensor service where the original sensor has failed or is reporting incorrect data.

Common Reasons for Replacement

• Check engine light or 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 failing downstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Before installation, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion. Confirm the threaded mounting location and downstream position match the vehicle application before removal. If the original sensor failed due to wiring or connector damage, repair those issues before installing the replacement sensor.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures sensors for application-specific fitment and ECU feedback requirements. The company is ISO 9001/TS 16949 certified, supporting consistent production and cataloged application coverage.