Delphi ES20066 Oxygen Sensor - Rear

Delphi ES20066 Heated Oxygen Sensor Overview

The Delphi ES20066 is a heated oxygen sensor designed specifically for the rear position on Mazda Miata models. This sensor helps maintain optimal engine performance and emissions control by accurately monitoring exhaust oxygen levels.

• Heated sensor type for faster warm-up and improved accuracy
• Four-wire design ensuring reliable electrical connections
• Square connector shape for secure fitment
• Thread size of 18 x 1.5 mm compatible with OEM specifications
• Overall length of 530.0 mm for proper installation
• Includes oxygen sensor and instruction sheet

Technical Details and Compatibility

The Delphi ES20066 oxygen sensor features a heated element that allows it to reach operating temperature quickly, reducing emissions during cold starts. Its four-wire configuration supports both the sensor signal and heater circuit, ensuring consistent performance. The square connector shape matches the factory harness on Mazda Miata vehicles, simplifying installation. With a thread size of 18 x 1.5 mm and an overall length of 530.0 mm, this sensor fits precisely in the rear exhaust position, maintaining proper exhaust flow and sensor function.

Applications and Problem Resolution

This oxygen sensor is compatible with Mazda Miata models requiring a rear heated oxygen sensor. It is commonly used to address issues such as:

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased emissions failing regulatory standards
• Rough engine idle or hesitation during acceleration
• Failed emissions tests related to sensor malfunction

Installation Notes and Tips

When installing the Delphi ES20066 oxygen sensor, ensure the vehicle is cool to avoid burns. Use the correct tools to avoid damaging the sensor threads. Verify the square connector securely mates with the vehicle harness to prevent electrical issues. Follow the included instruction sheet for proper torque specifications and sensor orientation.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet OEM standards for durability and performance. The ES20066 part number undergoes rigorous testing to ensure reliable operation in emission control systems. Warranty details should be confirmed with the point of purchase or manufacturer documentation.