Delphi ES20004 Oxygen Sensor - Rear

Delphi ES20004 Rear Oxygen Sensor

The Delphi ES20004 is a heated rear oxygen sensor built for precise exhaust monitoring on select Saturn applications. It uses a 4-wire design, a square connector, and an 18 x 1.5 mm thread size for direct-fit replacement on the rear position.

Key Features

• Heated oxygen sensor for faster operating response
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• 725.0 overall length
• Includes oxygen sensor and instruction sheet
• Rear position application

Detailed Description

Delphi ES20004 is engineered from OE heritage and decades of supplier experience, with design knowledge carried into the aftermarket part. This rear oxygen sensor is compatible with 2000 Saturn LS, 2000 Saturn LS1, and 2000 Saturn LW1 rear applications. It is a direct replacement choice for drivers searching for a 2000 Saturn LS rear oxygen sensor, a 2000 Saturn LS1 rear oxygen sensor, or a 2000 Saturn LW1 rear oxygen sensor. The Delphi ES20004 also cross-references Bosch 15503 for the same application.

What It Helps Address

• Check engine light related to rear oxygen sensor performance
• Incorrect exhaust feedback from a worn sensor
• Reduced emissions monitoring accuracy
• Slow sensor response from age or contamination
• Fault codes tied to rear O2 sensor circuit issues

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and rear position before installation. Match the sensor routing and overall length to the original layout on the vehicle. Confirm the exhaust threads are clean and in good condition before threading in the replacement sensor.

Quality Assurance

Delphi builds this oxygen sensor using OE-focused engineering and supplier experience developed over many years in the automotive industry. The ES20004 is backed by Delphi's aftermarket manufacturing standards.