Delphi ES20100 Oxygen Sensor - Rear

Delphi Heated Oxygen Sensor for Mazda and Subaru Vehicles

The Delphi ES20100 oxygen sensor is designed to provide accurate emissions monitoring for select Mazda and Subaru models. Featuring a heated sensor element and a four-wire design, this rear-position oxygen sensor helps maintain optimal engine performance and emissions control.

Key Features of the Delphi ES20100 Oxygen Sensor

• Heated sensor type for faster warm-up and improved accuracy
• Four-wire configuration ensuring reliable signal transmission
• Square connector shape for secure and precise fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicle exhaust systems
• Overall length of 445.0 mm suitable for rear exhaust placement
• Includes oxygen sensor and instruction sheet for installation guidance

Detailed Description of the Delphi ES20100 Oxygen Sensor

The Delphi ES20100 oxygen sensor is engineered to meet the emission control requirements of Mazda 626 and Subaru Impreza, Legacy, and Outback models. Its heated sensor element allows the sensor to reach operating temperature quickly, reducing the time the engine runs in open-loop mode. The four-wire design supports both the sensor signal and heater circuit, ensuring consistent performance and durability. The square connector shape and 18 x 1.5 mm thread size provide a precise fit in the rear exhaust position, helping maintain accurate air-fuel mixture readings for the vehicle's engine control unit.

Common Applications and Issues Addressed

• Helps reduce harmful emissions by monitoring exhaust oxygen levels
• Improves fuel efficiency by providing accurate air-fuel ratio data
• Prevents engine performance issues related to faulty oxygen sensors
• Resolves check engine light triggers related to rear oxygen sensor faults
• Supports compliance with emissions testing standards for Mazda and Subaru vehicles

Installation Notes and Tips

When installing the Delphi ES20100 oxygen sensor, ensure the vehicle is cooled down to avoid burns. Use the correct 18 x 1.5 mm thread size to avoid cross-threading. The square connector should be securely connected to prevent signal loss. It is recommended to follow the included instruction sheet for proper installation procedures and torque specifications. Verify sensor operation after installation by checking for diagnostic trouble codes and engine performance.

Quality Assurance and Warranty Information

Delphi oxygen sensors are manufactured to meet OEM specifications for durability and performance. The ES20100 part number undergoes rigorous testing to ensure reliable operation in emission control systems. While specific warranty details are not provided here, Delphi products typically come with a limited warranty covering defects in materials and workmanship. Consult the product documentation or supplier for exact warranty terms.