Delphi ES20418 Oxygen Sensor - Front Right, Rear, Rear Left or Rear Right

Delphi ES20418 Heated Oxygen Sensor Overview

The Delphi ES20418 is a heated oxygen sensor designed for precise emission control in select BMW and Mercedes-Benz models. Engineered with a 4-wire configuration and a round connector, this sensor ensures accurate air-fuel mixture readings for optimal engine performance.

• Heated oxygen sensor with 4 wires for reliable operation
• Round connector shape for secure and proper fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicles
• Overall length of 775.0 mm for correct installation depth
• Includes oxygen sensor and instruction sheet for installation guidance
• Compatible with front right, rear, rear left, and rear right positions

Technical Details and Compatibility

The Delphi ES20418 oxygen sensor features a heated design that allows it to reach operating temperature quickly, improving sensor response time and reducing emissions during cold starts. The 4-wire setup supports both the sensor signal and heater circuit, ensuring consistent performance. Its round connector and 18 x 1.5 mm thread size are engineered to fit precisely in the exhaust system of various BMW and Mercedes-Benz models, including the BMW 535i, 535i xDrive, 535xi, 740i, 740Li, and Mercedes-Benz C240, C320, CLK55 AMG, CLK320, CLK430, SLK55 AMG, and X6.

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 poor fuel economy linked to sensor malfunction
• Eliminates rough idling and hesitation due to incorrect sensor data

Installation Notes and Tips

When installing the Delphi ES20418 oxygen sensor, ensure the vehicle is compatible with the specified fitment list. Use the included instruction sheet for proper torque specifications and wiring connections. 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. Verify the sensor position matches the vehicle’s designated location such as front right or rear positions.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet OEM standards for durability and accuracy. The ES20418 part number undergoes rigorous testing to ensure reliable performance in emission control systems. While specific warranty details may vary, Delphi typically offers coverage against defects in materials and workmanship to support long-term use in BMW and Mercedes-Benz vehicles.