Walker 250-54043 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

OE Oxygen Sensor for Volvo and LR2

Walker Products OE 250-54043 is a heated oxygen sensor built for specific upstream applications on Volvo and Land Rover vehicles. It is engineered to deliver the ECU feedback needed for accurate air-fuel control, emissions monitoring, and drivability.

For Volvo S60, XC60, XC70, XC90, V60, V90, S80, and related models, this sensor is a direct-fit replacement for the listed upstream positions. Part number 250-54043 is also listed for Land Rover LR2 upstream left and right applications.

Key Features

• Heated oxygen sensor for upstream exhaust monitoring
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for OE-style connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 16.26
• Overall length: 19.8

Product Details

Walker Products OE focuses on original-equipment-style engine management and oxygen sensor replacements. Part number 250-54043 is manufactured for the specified fitment position so the sensor can provide the diagnostic feedback expected by the ECU. This matters on newer vehicles where a failing upstream sensor can trigger fault codes, reduce fuel economy, increase exhaust emissions, or illuminate the malfunction indicator light. If the sensor, connector, or harness is damaged, the operational life of the replacement can also be shortened.

This part cross-references no listed interchange numbers in the provided data. Search terms such as Volvo XC60 upstream oxygen sensor, Volvo S90 upstream O2 sensor, and Land Rover LR2 upstream oxygen sensor align with the confirmed applications for this part number.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rich or lean fuel mixture concerns
• Poor engine performance from inaccurate exhaust feedback
• Increased fuel consumption
• Higher exhaust emissions

Installation Notes

• Install only in the listed upstream positions for the confirmed Volvo and Land Rover applications.
• Inspect the sensor connector, wiring harness, and surrounding exhaust components before installation.
• Verify thread size and connector shape against the removed sensor before fitting.
• Use the vehicle’s ECU fault codes and service information to confirm the affected sensor location.

Quality Assurance

Walker Products is an ISO 9001/TS 16949 certified automotive supplier with a long history in engine management components. The Walker Products OE line is built around application-specific replacement parts for accurate fitment and diagnostic performance.