Walker 350-35066 Oxygen Sensor - Upstream or Upstream Left

Walker Oxygen Sensor for Volvo S80 and XC90

Walker Products 350-35066 is a heated oxygen sensor built as a specific-fit OE replacement for select Volvo applications. It is engineered to deliver the ECU feedback needed for accurate fuel control and emissions monitoring on upstream locations.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Volvo applications
• 5-wire configuration with male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 49.13 in.; overall length: 52.68 in.
• Radiused polygon connector shape for application-specific fitment

Application Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE-style replacement use. Part number 350-35066 is built for upstream sensor locations and is listed for 2000-2001 Volvo S80 upstream oxygen sensor for cylinders 4-6, 2002-2005 Volvo S80 upstream oxygen sensor for cylinders 1-3, and 2003-2005 Volvo XC90 upstream left oxygen sensor. This part number 350-35066 is intended for vehicles that rely on precise sensor feedback to help the ECU manage air-fuel ratio and emissions performance.

Fits 2000-2001 Volvo S80, upstream. Fits 2002-2005 Volvo S80, upstream. Fits 2003-2005 Volvo XC90, upstream left.

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

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 readings
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes

Verify the sensor position before installation, since this part is specific to upstream locations on the listed Volvo models. Inspect the sensor, wiring harness, and connector for physical damage before replacement, and confirm the threaded mounting point and connector style match the original unit. For best results, compare the vehicle’s fault codes and sensor location against the application notes for the Volvo S80 and Volvo XC90.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for a wide range of vehicle applications.