Walker 350-34437 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Walker 350-34437 Oxygen Sensor for BMW and Land Rover

Walker Products 350-34437 is a heated downstream oxygen sensor built as an OE-style replacement for specific BMW and Land Rover applications. It is engineered for the correct fitment position and ECU feedback, helping restore accurate exhaust monitoring on vehicles such as the BMW X3, X5, Z4, 325i, 330i, and Range Rover.

Key Features

• Heated oxygen sensor with 4-wire design
• Specific-fit replacement for the listed downstream positions
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon female connector for application-specific connection
• 36.54 in. wiring harness length and 40.08 in. overall length
• Walker Products Aftermarket engine management sensor line

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed for OE replacement use. Part number 350-34437 is built for downstream placement and is listed for BMW 320i, 323i, 325Ci, 325i, 325xi, 328i, 330Ci, 330i, 330xi, 525i, 528i, 530i, X3, X5, Z3, Z4, and Land Rover Range Rover applications across the model years shown. This sensor is designed to provide the diagnostic feedback the ECU expects from the affected exhaust position. If the original sensor has failed, the vehicle may store fault codes and show drivability or emissions-related symptoms.

For buyers searching for a BMW downstream oxygen sensor, BMW X5 oxygen sensor replacement, or Land Rover Range Rover downstream O2 sensor, Walker 350-34437 provides a direct-fit option for the specified positions. This part number is 350-34437.

What It Helps Address

• Check engine light or MIL illumination tied to oxygen sensor faults
• Poor engine performance caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a worn downstream sensor
• Fault codes stored in the ECU related to the affected sensor circuit

Installation Notes

Confirm the vehicle’s year, model, engine configuration, and sensor position before ordering. This listing includes downstream, downstream left, and downstream right applications depending on the vehicle. Inspect the sensor wiring harness and connector for damage before installation, since physical wear can shorten sensor life and affect operation. The threaded mount and connector style should match the original unit for proper installation.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. Part number 350-34437 is manufactured for specific application fitment and ECU feedback requirements, and it is part of the Walker Products Aftermarket sensor line.