Delphi ES20004 Oxygen Sensor - Rear

Delphi ES20004 Heated Oxygen Sensor Overview

The Delphi ES20004 is a heated oxygen sensor designed for precise emission control in select Saturn vehicles. Engineered to meet OEM specifications, this sensor ensures accurate air-fuel mixture readings for optimal engine performance and reduced emissions.

• Heated sensor type for faster warm-up and improved efficiency
• Four-wire design for reliable signal transmission
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified Saturn models
• Overall length of 725.0 mm for correct installation depth
• Positioned for rear installation in the exhaust system
• Includes oxygen sensor and instruction sheet for installation guidance

Technical Details and Compatibility

The Delphi ES20004 oxygen sensor features a heated element that allows it to reach operating temperature quickly, improving sensor response time and reducing emissions during cold starts. Its four-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 rear exhaust placement on Saturn LS, LS1, and LW1 models. With an overall length of 725.0 mm, this sensor fits precisely in the designated rear position, maintaining proper exhaust flow and sensor accuracy.

Applications and Problem Resolution

This oxygen sensor is compatible with the following Saturn vehicles:

• Saturn LS
• Saturn LS1
• Saturn LW1

Common issues addressed by replacing the Delphi ES20004 sensor include:

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased emissions failing regulatory standards
• Engine hesitation or rough idling caused by sensor malfunction
• Failed emissions tests related to exhaust sensor performance

Installation Notes and Tips

When installing the Delphi ES20004 oxygen sensor, ensure the vehicle is cool to avoid burns. Use the included instruction sheet for proper wiring and torque specifications. Verify the square connector aligns correctly to prevent connection issues. It is recommended to apply anti-seize compound on the threads to facilitate future removal. Confirm the sensor is installed in the rear exhaust position as specified for Saturn LS, LS1, and LW1 models.

Quality Assurance and Warranty

Delphi manufactures the ES20004 oxygen sensor to meet strict quality standards, ensuring durability and reliable performance. This sensor undergoes rigorous testing to comply with emission control requirements. Warranty coverage details should be confirmed at the point of purchase, as Delphi typically offers limited warranties on emission control components.