Walker 350-34594 Oxygen Sensor - Upstream Left or Upstream Right

Walker 350-34594 Oxygen Sensor for BMW

Walker Products 350-34594 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select BMW applications. It is built for upstream right and upstream left positions on 1994-1995 BMW 530i and 540i models, with fitment that matches the vehicle’s diagnostic requirements.

Key Features

• Heated oxygen sensor design for faster operating temperature
• Specific-fit application for direct vehicle matching
• 4-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for proper harness connection
• Wiring harness length: 20.2 in.; overall length: 23.74 in.

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed for OE replacement use. Part number 350-34594 is designed to provide the ECU with the feedback needed for closed-loop fuel control on the listed BMW 530i and BMW 540i applications. For BMW 530i oxygen sensor replacement or BMW 540i upstream oxygen sensor service, this sensor is matched to the specified position and connector style.

This part cross-references no listed interchange numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from a failing upstream sensor
• Higher exhaust emissions from inaccurate sensor readings
• Fault codes stored in the ECU for sensor-related issues

Installation Notes

Verify the vehicle position before ordering: this part is listed for upstream right and upstream left locations on the specified BMW models. Inspect the sensor wiring harness and connector for physical damage during diagnosis, since damaged wiring can shorten sensor life and affect operation. Confirm thread size, connector shape, and harness length against the original part before installation.

Quality Assurance

Walker Products states that its engine management sensors are manufactured for specific applications and fitment positions, with diagnostic feedback intended to meet ECU requirements. The brand also notes ISO 9001/TS 16949 certification and long-standing experience in engine management and fuel system components.