Walker 350-34473 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-34473 Oxygen Sensor Overview

Walker Products 350-34473 is a heated oxygen sensor built as a direct-fit OE-style replacement for specific BMW applications. It is engineered for the correct mounting position and ECU feedback, helping restore accurate exhaust monitoring on supported BMW 318i, 318is, 318ti, 325is, M3, 530i, and 840Ci models.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34473 part number is designed around the vehicle’s sensor location, connector style, and threaded mounting requirements for a precise replacement.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed BMW upstream positions
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting type with 18.0 mm thread diameter
• 14.29 in. wiring harness length and 17.83 in. overall length
• Supports ECU feedback for emissions and fuel control systems

Detailed Product Description

Walker Products 350-34473 is an upstream oxygen sensor for 1992-1995 BMW 318i and 318is, 1995 BMW 318ti, 1992 and 1994-1995 BMW 325is and M3, plus 1994 BMW 530i and 840Ci applications listed below. It is built to match the original sensor location and electrical interface so the engine control unit can read exhaust oxygen data as intended. For BMW 318i upstream oxygen sensor replacement, BMW M3 upstream oxygen sensor service, or BMW 530i upstream left/right sensor replacement, this part number provides the correct application-specific format.

This Walker Products Aftermarket oxygen sensor is intended for vehicles that use a heated, threaded, specific-fit sensor with a female connector. Part number 350-34473 should be selected when the vehicle calls for an upstream sensor in the listed position and connector style.

Vehicle Fitment

• Fits 1992-1995 BMW 318i, Upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor; front oxygen sensor compatible with various vehicle models.
• Fits 1992-1995 BMW 318is, Upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor; front oxygen sensor compatible with various vehicle models.
• Fits 1995 BMW 318ti, Upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor; front oxygen sensor compatible with various vehicle models.
• Fits 1992 BMW 325is, Upstream. Install upstream oxygen sensor for optimal performance.
• Fits 1994-1995 BMW 325is, Upstream. Install upstream oxygen sensor for optimal performance.
• Fits 1994-1995 BMW M3, Upstream. Upstream oxygen sensor for cylinders 4-6; oxygen sensor fits cylinders 1-3 for upstream installation.
• Fits 1994 BMW 530i, Upstream Right. To 06/1994; Al 06/1994; Upstream; Right.
• Fits 1994 BMW 530i, Upstream Left. To 06/1994; Al 06/1994; Upstream; Left.
• Fits 1994 BMW 840Ci, Upstream Right. Install upstream oxygen sensor on the right side.
• Fits 1994 BMW 840Ci, Upstream Left. Install upstream oxygen sensor on the left side.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel control
• 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’s exact year, model, and sensor position before ordering Walker 350-34473. Match the upstream location, connector shape, wire count, and threaded mounting style to the original part. Inspect the sensor wiring harness and connector for damage during diagnosis, since damaged wiring can shorten sensor life and affect readings.

For BMW 318i upstream oxygen sensor replacement or BMW 530i upstream left/right sensor service, verify the ECU fault code and the physical sensor location before installation.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement parts for specific applications and builds them under Automotive ISO9001/TS 16949 certified processes. Part number 350-34473 reflects that application-specific approach for supported BMW vehicles.