Delphi ES20003 Oxygen Sensor - Rear

Delphi ES20003 Heated Oxygen Sensor Overview

The Delphi ES20003 is a heated oxygen sensor designed for rear position installation on select Chevrolet, Oldsmobile, and Pontiac models. This sensor helps maintain optimal engine performance and emissions control by accurately monitoring oxygen levels in the exhaust system.

• Heated sensor type for faster warm-up and improved accuracy
• Four-wire design ensuring reliable electrical connections
• Square connector shape for secure fitment
• Thread size of 18 x 1.5 mm compatible with specified vehicles
• Overall length of 1140 mm for proper installation reach
• Includes oxygen sensor and instruction sheet for installation guidance

Technical Details and Compatibility

The Delphi ES20003 oxygen sensor features a heated element that allows the sensor to reach operating temperature quickly, reducing emissions during cold starts. Its four-wire configuration supports both the sensor signal and heater circuit, ensuring consistent performance. The square connector shape and 18 x 1.5 mm thread size are engineered to fit securely in the rear exhaust position of compatible vehicles. This sensor is specifically compatible with Chevrolet Malibu and Corvette, Oldsmobile Cutlass, and Pontiac Alero, Grand Am models, providing precise fitment and function.

Common Applications and Problem Resolution

• Helps resolve rough idling caused by incorrect air-fuel mixture readings
• Reduces engine hesitation and stalling related to faulty oxygen sensors
• Assists in lowering emissions by providing accurate exhaust gas data
• Prevents check engine light triggers related to oxygen sensor faults
• Improves fuel efficiency by enabling proper engine management adjustments

Installation Notes and Tips

When installing the Delphi ES20003 oxygen sensor, ensure the vehicle is cooled down to avoid burns. Use the included instruction sheet for proper wiring and torque specifications. Verify the sensor’s rear position placement and connector orientation to match the original equipment. It is recommended to inspect the exhaust threads and clean them before installation to ensure a secure fit. Avoid over-tightening to prevent damage to the sensor or exhaust manifold.

Quality Assurance and Warranty

Delphi oxygen sensors are manufactured to meet or exceed OEM standards for durability and performance. The ES20003 part number undergoes rigorous testing to ensure reliable operation under various driving conditions. While specific warranty details may vary, Delphi typically offers coverage against defects in materials and workmanship, providing confidence in the sensor’s long-term functionality.