Walker 350-34062 Oxygen Sensor - Upstream

Walker 350-34062 Oxygen Sensor for BMW Upstream Fitment

Walker Products 350-34062 is a heated oxygen sensor built for specific upstream applications on select BMW models. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34062 follows that approach with a threaded, 4-wire heated design and a female radiused-polygon connector for direct replacement use on the listed BMW vehicles.

Key Features

• Part number: 350-34062
• Heated oxygen sensor for upstream placement
• Specific fit design for listed BMW applications
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 56.42
• Overall length: 59.96

Detailed Description

This Walker oxygen sensor is intended for upstream installation on 1988-1993 BMW 535i, 1991-1993 BMW M5, 1988-1992 BMW 735i, 1988-1992 BMW 735iL, 1988-1989 BMW 635CSi, and 1988 BMW 535is. As a heated sensor, it is built to provide faster operating response once the exhaust reaches temperature, supporting the ECU’s fuel-trim and emissions monitoring strategy. If you are replacing a BMW upstream oxygen sensor for 1988-1993 BMW 535i or 1991-1993 BMW M5 service, this part number 350-34062 is matched to the listed application details.

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

What It Helps Address

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

Installation Notes and Tips

Confirm upstream location before installation and verify connector shape, wire count, and thread diameter against the removed sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. Use the vehicle’s service information for torque and routing details, and make sure the exhaust threads are clean before threading in the replacement sensor.

Quality Assurance

Walker Products Aftermarket has produced engine management and oxygen/air-fuel sensors since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-34062 is manufactured as a specific-application replacement for the listed BMW fitments.