Delphi ES20409 Oxygen Sensor - Rear, Rear Left or Rear Right

Delphi ES20409 Heated Oxygen Sensor Overview

The Delphi ES20409 is a heated oxygen sensor designed for precise emission control in select Ford, Lincoln, Mazda, and Mercury vehicles. Engineered with a 4-wire configuration and a square connector shape, this sensor ensures accurate air-fuel mixture readings for optimal engine performance.

• Heated oxygen sensor with 4 wires for reliable operation
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicles
• Overall length of 345.0 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 ES20409 oxygen sensor is engineered to meet the emission control requirements of various Ford, Lincoln, Mazda, and Mercury models, including the Ford Edge, Explorer, Fusion, Taurus, Lincoln MKX, MKZ, MKS, MKT, Milan, Mercury Milan, and Mazda CX-9. Its heated sensor type allows for faster warm-up times, improving sensor responsiveness and reducing emissions during cold starts. The 4-wire design supports both the sensor signal and heater circuit, ensuring consistent performance. The square connector shape and 18 x 1.5 mm thread size provide a secure and precise fit in the rear sensor positions, including rear left and rear right, depending on vehicle specifications.

Common Applications and Problem Resolution

• Helps maintain proper air-fuel ratio for efficient combustion
• Reduces engine misfires caused by faulty oxygen sensor readings
• Prevents increased emissions and failed emissions tests
• Addresses check engine light triggers related to oxygen sensor faults
• Improves fuel economy by providing accurate sensor data to the engine control unit

Installation Notes and Tips

When installing the Delphi ES20409 oxygen sensor, ensure the vehicle is cooled down to avoid burns. Use the included instruction sheet for guidance on sensor placement and torque specifications. Verify the sensor position matches the rear, rear left, or rear right location as required by your specific vehicle model. Properly connect the 4-wire harness with the square connector to avoid electrical issues. It is recommended to use anti-seize compound on the threads to facilitate future removal.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet OEM standards for durability and performance. The ES20409 part number undergoes rigorous testing to ensure reliable operation under various driving conditions. While specific warranty details may vary, Delphi typically offers coverage against defects in materials and workmanship. Refer to the product documentation or manufacturer for exact warranty terms.