Delphi ES20156 Oxygen Sensor - Front, Rear, Rear Left or Rear Right

Delphi ES20156 Oxygen Sensor Overview

The Delphi ES20156 is a heated oxygen sensor designed for precise emission control in select Lexus and Toyota vehicles. Engineered to meet OEM specifications, this sensor supports optimal engine performance and reduced emissions for models like the Lexus GS300 and Toyota Highlander.

• 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 specified vehicle ports
• Overall length of 750.0 mm for proper installation depth
• Includes oxygen sensor and instruction sheet for installation guidance
• Position-specific fitment: front, rear, rear left, and rear right

Technical Details and Compatibility

The Delphi ES20156 oxygen sensor features a heated design that allows it to reach operating temperature quickly, improving fuel efficiency and emissions control. 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 secure and precise fit in the exhaust system. With an overall length of 750 mm, this sensor is engineered to fit the exhaust ports of Lexus GS300, Toyota Highlander, and Toyota RAV4 models. The package includes the sensor itself along with an instruction sheet to assist with installation.

Applications and Problem Resolution

This oxygen sensor is used to monitor the oxygen levels in the exhaust gases, enabling the engine control unit to adjust the air-fuel mixture for optimal combustion. It is compatible with the following vehicles:

• Lexus GS300
• Toyota Highlander
• Toyota RAV4

Common issues addressed by replacing the ES20156 oxygen sensor include:

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased emissions and failed emissions tests
• Engine performance problems such as rough idling or hesitation
• Failed or degraded sensor heater circuit

Installation Notes and Tips

When installing the Delphi ES20156 oxygen sensor, ensure the vehicle is cool to avoid burns. Use the correct socket size for the 18 x 1.5 mm thread to prevent damage. Verify the sensor position—front, rear, rear left, or rear right—matches the vehicle’s requirements. Follow the included instruction sheet carefully for wiring connections and torque specifications. It is recommended to inspect the wiring harness and connector for corrosion or damage before installation.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet strict quality standards and OEM specifications. The ES20156 part number undergoes rigorous testing to ensure durability and accurate sensor response. While specific warranty details may vary, Delphi typically offers a limited warranty covering defects in materials and workmanship. Refer to the product documentation or supplier for exact warranty terms.