Delphi ES20057 Oxygen Sensor - Rear, Rear Left or Rear Right

Delphi ES20057 Heated Oxygen Sensor Overview

The Delphi ES20057 is a heated oxygen sensor designed for precise emission control in select Nissan and INFINITI vehicles. Engineered with a 4-wire configuration and a square connector shape, this sensor ensures accurate readings and reliable performance for models like the Nissan Altima and INFINITI Q45.

• Heated oxygen sensor with 4 wires for efficient operation
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicles
• Overall length of 300.0 mm for correct installation depth
• Includes oxygen sensor and instruction sheet for installation guidance
• Position-specific fitment: rear, rear left, and rear right locations

Technical Details and Compatibility

The Delphi ES20057 oxygen sensor features a heated sensor type that allows for faster warm-up times and improved fuel mixture readings. Its 4-wire design supports both the sensor signal and heater circuit, enhancing responsiveness and durability. The square connector shape ensures a secure electrical connection, reducing the risk of disconnection or signal loss. With a thread size of 18 x 1.5 mm and an overall length of 300.0 mm, this sensor fits precisely in the rear positions of compatible Nissan and INFINITI models, including the 200SX, 240SX, Altima, Q45, and Sentra. The package includes the oxygen sensor and an instruction sheet to assist with proper installation.

Applications and Problem Resolution

• Helps maintain optimal air-fuel ratio for efficient engine performance
• Reduces harmful emissions by providing accurate exhaust gas readings
• Addresses issues such as rough idling and poor fuel economy
• Prevents check engine light triggers related to oxygen sensor faults
• Supports proper catalytic converter function by monitoring exhaust gases

Installation Notes and Tips

When installing the Delphi ES20057 oxygen sensor, ensure the vehicle is compatible with the specified fitment for rear, rear left, or rear right positions. Use the included instruction sheet for guidance on torque specifications and connector alignment. It is recommended to disconnect the battery before installation to avoid electrical shorts. Verify the thread size of 18 x 1.5 mm matches the vehicle’s exhaust port. Proper installation will help maintain sensor accuracy and longevity.

Quality Assurance and Warranty

Delphi manufactures the ES20057 oxygen sensor to meet OEM standards for durability and performance. This sensor undergoes rigorous testing to ensure reliable operation under various driving conditions. While specific warranty details may vary, Delphi typically offers coverage against manufacturing defects to provide confidence in product quality.