Walker 350-35012 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-35012 Oxygen Sensor for BMW and Mini

Walker Products 350-35012 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select BMW and Mini applications. It is built for upstream use and provides the ECU with the feedback needed to monitor air-fuel control and emissions performance.

For drivers searching for a BMW upstream oxygen sensor or a Mini Cooper Countryman Bank 1 Sensor 1 replacement, this Walker Products Aftermarket part number 350-35012 is designed around the vehicle’s original sensor location and connector layout.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed BMW and Mini applications
• Threaded mounting type with 18.0 mm thread diameter
• 5-wire configuration with female connector
• Wiring harness length: 16.26
• Overall length: 19.8
• Radiused polygon connector shape
• Walker Products Aftermarket engine management sensor

Product Details

Walker Products has supplied engine management and oxygen sensor components since 1946, with a focus on OE replacement fitment and application-specific sensor feedback. Part number 350-35012 is intended for upstream oxygen sensor locations on select BMW 650i, 750i, X5, X6, M5, M6, and Mini Cooper models, including upstream right and upstream left positions where listed. This makes it a direct search match for buyers needing a BMW upstream right oxygen sensor, BMW upstream left oxygen sensor, or a Mini front oxygen sensor replacement.

This part cross-references common OE-style replacement needs for the same application.

What It Helps Address

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

Installation Notes and Tips

Confirm the vehicle’s bank and sensor position before ordering, especially on BMW upstream right and upstream left applications. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Because this is a threaded sensor, verify thread diameter and mounting location match the original unit. For best results, clear stored fault codes after installation and confirm the ECU reads the new sensor correctly.

Quality Assurance

Walker Products manufactures this oxygen sensor as an OE replacement application part and builds its engine management components under ISO 9001/TS 16949 quality systems. The 350-35012 is developed for the specified fitment positions and diagnostic feedback requirements used by the ECU.