Delphi ES20320 Oxygen Sensor - Front Left, Rear, Rear Left or Rear Right

Delphi ES20320 Heated Oxygen Sensor Overview

The Delphi ES20320 is a heated oxygen sensor designed for precise emission control in select GM vehicles. Engineered with a 4-wire configuration and a square connector, this sensor ensures accurate air-fuel mixture readings for optimal engine performance.

• Heated oxygen sensor with 4 wires for fast response
• Square connector shape for secure and reliable connection
• Thread size of 18 x 1.5 mm for direct fitment
• Overall length of 310.0 mm to match OEM specifications
• Includes oxygen sensor and instruction sheet for installation guidance
• Compatible with front left, rear, rear left, and rear right positions

Technical Details and Compatibility

The Delphi ES20320 oxygen sensor features a heated design that allows it to reach operating temperature quickly, improving emission control efficiency. Its 4-wire setup supports both sensor heating and signal transmission, enhancing durability and accuracy. The square connector shape ensures a secure fit with factory wiring harnesses, while the 18 x 1.5 mm thread size matches OEM standards for easy installation. With an overall length of 310.0 mm, this sensor fits precisely in the designated mounting locations.

This oxygen sensor is compatible with a range of General Motors vehicles, including Buick, Chevrolet, GMC, Hummer, Oldsmobile, Pontiac, and Saturn models. Specific fitment includes vehicles such as the Chevrolet Impala, Malibu, Equinox, and Corvette, as well as the Buick LaCrosse and Regal, GMC Sierra, Hummer H3, Pontiac Grand Prix, and Saturn Vue among others.

Common Applications and Problem Resolution

• Helps maintain proper air-fuel ratio for efficient combustion
• Reduces emissions by providing accurate oxygen level data to the engine control unit
• Addresses issues like rough idling and poor fuel economy caused by faulty sensors
• Prevents check engine light triggers related to oxygen sensor faults
• Supports smooth engine performance and reduced exhaust emissions

Installation Notes and Tips

When installing the Delphi ES20320 oxygen sensor, ensure the engine is cool to avoid burns. Use the included instruction sheet for proper wiring and positioning guidance. Verify the sensor’s thread size matches the vehicle’s exhaust port to prevent cross-threading. It is recommended to apply anti-seize compound on the threads before installation to facilitate future removal. Confirm the sensor is connected securely to the square connector to avoid signal interruptions.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The ES20320 part number undergoes rigorous testing for accuracy and longevity. While specific warranty details may vary, Delphi typically offers coverage against manufacturing defects to provide confidence in product quality.