Delphi ES20056 Oxygen Sensor - Rear, Rear Left or Rear Right

Delphi ES20056 Heated Oxygen Sensor Overview

The Delphi ES20056 is a heated oxygen sensor designed for precise emission control in select Nissan and INFINITI vehicles. Engineered to provide accurate air-fuel mixture readings, this sensor supports optimal engine performance and reduced emissions.

• Heated sensor type for faster warm-up and accurate readings
• 4-wire configuration ensuring reliable signal and heater circuit
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicle models
• Overall length of 910 mm for correct installation reach
• Includes oxygen sensor and instruction sheet for installation guidance
• Position-specific fitment: rear, rear left, and rear right locations

Detailed Product Description

The Delphi ES20056 oxygen sensor is a heated type sensor featuring a 4-wire design that supports both the sensor signal and the integrated heater circuit. This configuration allows the sensor to reach operating temperature quickly, improving emission control efficiency shortly after engine start. The sensor’s square connector shape and 18 x 1.5 mm thread size ensure compatibility with the rear oxygen sensor ports on Nissan Frontier, Pathfinder, Xterra, and INFINITI QX4 models. With an overall length of 910 mm, the sensor is designed to fit precisely in the rear left or rear right positions, depending on the vehicle’s specific requirements. The package includes the oxygen sensor and an instruction sheet to assist with proper installation.

Compatible Vehicles and Applications

• Nissan Frontier (rear oxygen sensor replacement)
• Nissan Pathfinder (rear left and rear right sensor positions)
• Nissan Xterra (rear sensor fitment)
• INFINITI QX4 (rear oxygen sensor applications)

Common Issues Addressed by the Delphi ES20056 Oxygen Sensor

• Check engine light triggered by faulty rear oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture data
• Increased emissions from delayed sensor warm-up
• Engine performance issues related to exhaust gas monitoring
• Failed emissions tests caused by sensor malfunction

Installation Notes and Tips

When installing the Delphi ES20056 oxygen sensor, ensure the vehicle is cooled down to avoid burns. Use a proper oxygen sensor socket to prevent damage to the sensor or wiring. Verify the sensor’s position matches the rear left or rear right location as specified for your Nissan or INFINITI model. Follow the included instruction sheet carefully for torque specifications and connector engagement. It is recommended to inspect the wiring harness and connector for corrosion or damage before installation.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet OEM specifications for durability and performance. The ES20056 part number undergoes rigorous testing to ensure reliable operation under various driving conditions. Delphi typically offers a limited warranty covering defects in materials and workmanship; please refer to the product documentation for specific warranty details.