Walker 250-23109 Oxygen Sensor - Upstream Left

Overview of Walker 250-23109 Oxygen Sensor

The Walker 250-23109 oxygen sensor is designed specifically for select Nissan and INFINITI models, including the Frontier, Pathfinder, QX4, and Xterra. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by monitoring exhaust gases effectively.

• Heated oxygen sensor with 3-wire design for precise readings
• Specific fit for Nissan Frontier, Pathfinder, QX4, and Xterra
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for secure electrical connection
• Wiring harness length of 34.37 inches and overall length of 37.91 inches
• Wire gauge measurement of 20 for reliable signal transmission

Detailed Product Description

This Walker Products OE oxygen sensor (part number 250-23109) is engineered to meet the exact specifications of your vehicle’s original equipment. Featuring a heated sensor type, it quickly reaches operating temperature to provide accurate oxygen level readings, which are critical for maintaining proper air-fuel mixture and reducing emissions. The sensor’s 3-wire configuration supports efficient heating and signal output, while the radiused polygon male connector ensures a secure and corrosion-resistant connection. With a threaded mounting type and an 18.0 mm thread diameter, installation aligns precisely with factory requirements. The wiring harness length of 34.37 inches and overall length of 37.91 inches provide ample reach for straightforward installation in the exhaust system of Nissan Frontier, Pathfinder, QX4, and Xterra models.

Walker Products OE Brand Line

The Walker Products OE line focuses on delivering direct-fit emission control components that meet or exceed original equipment standards. This oxygen sensor is part of that line, ensuring compatibility and performance consistent with factory-installed parts. Using Walker Products OE parts helps maintain vehicle emissions compliance and engine efficiency without modification.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for proper fuel mixture control
• Resolves check engine light triggers related to oxygen sensor faults
• Improves fuel economy by ensuring correct air-fuel ratios
• Reduces harmful emissions by maintaining catalytic converter efficiency
• Eliminates rough idling or engine hesitation caused by faulty sensors

Installation Notes and Tips

When installing the Walker 250-23109 oxygen sensor, ensure the vehicle is cool to avoid burns. Use an oxygen sensor socket or appropriate tool to remove the old sensor carefully. Verify the connector type matches the vehicle harness before installation. Thread the sensor by hand initially to avoid cross-threading, then tighten to manufacturer torque specifications. Check for secure electrical connections and proper routing of the wiring harness to prevent damage from heat or moving parts.

Quality Assurance and Warranty

Walker Products OE oxygen sensors are manufactured to meet stringent quality standards for durability and performance. While specific warranty details may vary, Walker typically offers coverage against defects in materials and workmanship. Using this part helps maintain compliance with emissions regulations and supports reliable vehicle operation.