Delphi ES20123 Oxygen Sensor - Center, Rear or Rear Left

Delphi ES20123 Heated Oxygen Sensor Overview

The Delphi ES20123 is a heated oxygen sensor designed for precise emission control in select Mazda vehicles. Engineered to meet OEM specifications, this sensor helps maintain optimal air-fuel mixture for efficient engine performance and reduced emissions.

• Heated sensor type for faster warm-up and accurate readings
• 4-wire configuration ensuring reliable electrical connections
• Square connector shape for secure fitment
• Thread size of 18 x 1.5 mm compatible with specific Mazda exhaust ports
• Overall length of 660.0 mm suitable for center, rear, and rear left positions
• Includes oxygen sensor and instruction sheet for installation guidance

Technical Details and Compatibility

The Delphi ES20123 oxygen sensor features a heated design that accelerates sensor activation, improving fuel efficiency and emission control shortly after engine start. Its 4-wire setup 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 precise fit for Mazda models including the 6, MPV, Protege, and Protege5. With an overall length of 660 mm, this sensor is intended for center, rear, and rear left exhaust positions, depending on vehicle-specific requirements.

Applications and Problem Resolution

• Helps correct air-fuel mixture for improved fuel economy
• Reduces harmful emissions by providing accurate oxygen level data
• Prevents engine performance issues related to faulty oxygen sensors
• Addresses check engine light triggers caused by sensor failure
• Supports smooth engine idling and acceleration response

Installation Notes and Tips

When installing the Delphi ES20123 oxygen sensor, ensure the vehicle is compatible with the specified fitment: Mazda 6, MPV, Protege, and Protege5 models. Use the included instruction sheet for proper torque specifications and connector alignment. It is recommended to replace the sensor when the engine is cool to avoid burns and to apply anti-seize compound on the threads to facilitate future removal.

Quality Assurance and Warranty

Delphi manufactures the ES20123 oxygen sensor to meet strict quality standards, ensuring durability and reliable operation under normal driving conditions. This part is backed by Delphi's standard warranty coverage, providing confidence in its performance and longevity.