Walker 350-35054 Oxygen Sensor - Downstream, Upstream or Upstream Left

Walker 350-35054 Oxygen Sensor Overview

Walker Products 350-35054 is a heated oxygen sensor built as an OE-style replacement for specific BMW and Mercedes-Benz applications. It is engineered for the correct fitment position, wiring layout, and ECU feedback needed for accurate exhaust monitoring.

For BMW 535i, BMW 740i, BMW 740Li, BMW X6, and Mercedes-Benz CLK63 AMG or E320 applications, this sensor supports the engine management system by reporting exhaust oxygen data to the ECU. The Walker Products Aftermarket line focuses on application-specific engine management sensors for direct replacement use.

Key Features

• Heated oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed vehicle applications
• 5-wire configuration with a 48.74 in. wiring harness
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon connector shape with male connector gender
• Overall length: 52.28 in.
• Walker Products Aftermarket part number 350-35054

Detailed Description

Walker Products 350-35054 is designed for vehicles that require a direct replacement oxygen sensor with the correct connector, harness length, and mounting style. The heated sensor design helps the ECU monitor air-fuel mixture and exhaust efficiency, which is important for maintaining proper engine performance and emissions control. This part number is listed for upstream positions on BMW 535i, BMW 535i xDrive, BMW 740i, BMW 740Li, BMW X6, and BMW 535xi applications, plus upstream left coverage for Mercedes-Benz CLK63 AMG and downstream coverage for Mercedes-Benz E320.

Walker Products Aftermarket develops engine management and oxygen/air-fuel sensors as OE replacement components for many vehicles worldwide. The 350-35054 follows that approach with application-specific fitment and diagnostic feedback requirements in mind. If you are replacing a BMW 740i upstream oxygen sensor or a Mercedes-Benz E320 downstream oxygen sensor, this part number provides a targeted replacement path.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine running caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel data
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the exact position before installation: upstream, upstream left, or downstream, depending on the vehicle. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement, since physical damage can shorten sensor life. Verify thread size, connector style, and harness routing against the original part to ensure proper installation on BMW 535i, BMW 740Li, BMW X6, and Mercedes-Benz applications.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company with a long history in engine management and fuel system components. The Walker Products Aftermarket line is built around application-specific replacement parts for modern diagnostic systems, and part number 350-35054 reflects that OE-style approach.