Delphi ES20204 Oxygen Sensor - Rear

Delphi ES20204 Heated Oxygen Sensor Overview

The Delphi ES20204 is a heated oxygen sensor designed for precise emission control in select Hyundai and Mitsubishi vehicles. Engineered with a 4-wire configuration and a square connector shape, this sensor ensures accurate readings and reliable performance in the rear exhaust position.

• Heated oxygen sensor with 4 wires for efficient operation
• Square connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified models
• Overall length of 400 mm for correct installation depth
• Includes oxygen sensor and instruction sheet for installation guidance
• Designed for rear position installation in exhaust system

Technical Details and Compatibility

The Delphi ES20204 oxygen sensor features a heated sensor type that allows for faster warm-up times and improved fuel mixture readings. Its 4-wire design supports both sensor heating and signal transmission, enhancing durability and accuracy. The square connector shape ensures a secure electrical connection, reducing the risk of sensor failure due to loose contacts. With a thread size of 18 x 1.5 mm and an overall length of 400 mm, this sensor fits precisely in the rear exhaust port of compatible vehicles.

This oxygen sensor is compatible with Hyundai Elantra and Sonata models, as well as Mitsubishi Excel and Precis vehicles. The rear position placement is critical for monitoring exhaust gases after the catalytic converter, helping maintain emission standards and engine efficiency.

Common Applications and Problem Resolution

• Helps resolve issues related to poor fuel economy caused by incorrect air-fuel mixture readings
• Addresses check engine light triggers related to oxygen sensor faults in Hyundai Elantra and Mitsubishi Excel
• Improves emission control by providing accurate exhaust gas data to the engine control unit
• Reduces rough idling and engine performance problems linked to faulty rear oxygen sensors
• Supports compliance with emission regulations by ensuring proper sensor function

Installation Notes and Tips

When installing the Delphi ES20204 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 4-wire connector should be securely attached to prevent electrical issues. Follow the included instruction sheet carefully for proper torque specifications and sensor orientation. It is recommended to inspect the wiring harness and connector for damage before installation.

Quality Assurance and Warranty

Delphi manufactures the ES20204 oxygen sensor to meet OEM specifications for Hyundai and Mitsubishi vehicles. The sensor undergoes rigorous testing to ensure durability and accurate performance under various operating conditions. While specific warranty details may vary, Delphi typically offers coverage against manufacturing defects to provide confidence in product reliability.