Delphi ES20390 Oxygen Sensor - Rear

Delphi ES20390 Oxygen Sensor Overview

The Delphi ES20390 is a heated oxygen sensor designed specifically for the rear position on Mazda 3 models. This sensor plays a critical role in monitoring exhaust gases to optimize engine performance and reduce emissions.

• Heated sensor type for faster response times
• Four-wire design ensuring accurate signal transmission
• Square connector shape for secure and reliable connection
• Thread size of 18 x 1.5 mm compatible with Mazda 3 exhaust systems
• Overall length of 800 mm for proper fitment in rear exhaust location
• Includes oxygen sensor and instruction sheet for installation guidance

Detailed Product Description

The Delphi ES20390 oxygen sensor is engineered to meet the specific requirements of Mazda 3 vehicles. Featuring a heated sensor element, it quickly reaches optimal operating temperature, providing precise oxygen level readings to the engine control unit (ECU). The four-wire configuration supports both the sensor signal and heater circuit, improving sensor responsiveness and durability. Its square connector shape ensures a secure fit with the vehicle’s wiring harness, while the 18 x 1.5 mm thread size matches the factory exhaust port. With an overall length of 800 mm, this sensor is designed for the rear exhaust position, helping maintain proper emissions control and engine efficiency.

Common Applications and Issues Addressed

• Helps reduce excessive fuel consumption caused by faulty oxygen sensors
• Prevents engine performance issues related to incorrect air-fuel mixture
• Assists in lowering harmful exhaust emissions to meet regulatory standards
• Resolves check engine light triggers related to rear oxygen sensor faults
• Supports smooth engine operation and improved fuel economy

Installation Notes and Tips

• Ensure the vehicle is cool before sensor removal to avoid burns
• Use appropriate oxygen sensor socket or wrench for installation
• Apply anti-seize compound on threads if not pre-coated to prevent seizing
• Verify connector shape matches vehicle harness before installation
• Follow the included instruction sheet for proper torque specifications and wiring connections

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet OEM specifications, ensuring reliable performance and durability. The ES20390 part number undergoes rigorous testing to comply with emission control standards. While specific warranty details may vary, Delphi typically offers coverage against defects in materials and workmanship to provide confidence in product quality.