Delphi ES20055 Oxygen Sensor - Rear Left

Delphi ES20055 Heated Oxygen Sensor Overview

The Delphi ES20055 is a heated oxygen sensor designed for precise emission control in select Nissan and Infiniti vehicles. Engineered to meet OEM specifications, this sensor ensures accurate air-fuel mixture readings for optimal engine performance and reduced emissions.

• Heated oxygen sensor with 4-wire design for reliable operation
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with rear left position
• Overall length of 1295.0 mm for correct installation depth
• Includes oxygen sensor and instruction sheet for installation guidance

Technical Details and Compatibility

The Delphi ES20055 oxygen sensor features a heated element that allows it to reach operating temperature quickly, improving sensor response time and fuel efficiency. Its 4-wire configuration supports both the sensor signal and heater circuit, ensuring consistent performance. The square connector shape and 18 x 1.5 mm thread size are designed specifically for the rear left position on Nissan Pathfinder and Infiniti QX4 models. With an overall length of 1295.0 mm, this sensor fits precisely to maintain proper exhaust system function.

Compatible Vehicles and Applications

This oxygen sensor is compatible with the following vehicles:

• Nissan Pathfinder (rear left oxygen sensor replacement)
• Infiniti QX4 (rear left oxygen sensor replacement)

Using the Delphi ES20055 ensures your vehicle’s emission control system operates within manufacturer specifications, helping to maintain engine efficiency and reduce harmful exhaust emissions.

Common Issues Addressed by the ES20055 Oxygen Sensor

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased emissions failing vehicle inspection tests
• Engine hesitation or rough idling caused by sensor malfunction
• Failed catalytic converter performance linked to sensor issues

Installation Notes and Tips

When installing the Delphi ES20055 oxygen sensor, ensure the vehicle is cool to avoid burns. Use the included instruction sheet for proper wiring and torque specifications. Verify the sensor is installed in the rear left position with the correct thread size of 18 x 1.5 mm. Avoid damaging the sensor wiring or connector during installation to maintain sensor integrity.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet strict quality standards and OEM requirements. The ES20055 part number undergoes rigorous testing to ensure durability and accurate sensor readings. While specific warranty details may vary, Delphi typically offers coverage against defects in materials and workmanship to provide confidence in product reliability.