Delphi ES10909 Oxygen Sensor - Front

Delphi ES10909 Oxygen Sensor Overview

Delphi ES10909 is a heated front oxygen sensor built for precise exhaust monitoring and OE-style replacement performance. It uses a 4-wire design with a triangle connector and 18 x 1.5 mm thread size for direct-fit service on select GM and Saab applications.

Compatible With 2004-2005 Buick Rainier, front; 2004-2005 Chevrolet Colorado, front; 2004-2005 Chevrolet Trailblazer, front; and other listed applications, this Delphi oxygen sensor supports accurate air-fuel feedback for drivability and emissions control. Delphi’s OE heritage and supplier experience are built into the ES10909.

Key Features

• Heated oxygen sensor for faster operating temperature response
• 4-wire configuration for signal and heater circuit operation
• Triangle connector shape for application-specific fitment
• 18 x 1.5 mm thread size for direct installation in the exhaust stream
• Front position sensor for listed vehicles
• Includes oxygen sensor and instruction sheet

Detailed Description

The Delphi ES10909 oxygen sensor is engineered for front sensor locations on select 2004-2005 Buick Rainier, Chevrolet Colorado, Chevrolet Trailblazer, Chevrolet Trailblazer EXT, GMC Canyon, GMC Envoy, GMC Envoy XL, GMC Envoy XUV, Isuzu Ascender, 2005 Saab 9-7x, and 2004 Oldsmobile Bravada models. As a heated sensor, it reaches operating temperature quickly to help the engine control module monitor exhaust oxygen content sooner after startup. Delphi draws on OE experience and supplier knowledge to produce an aftermarket replacement that follows the original application requirements.

This part cross-references Bosch 13847 and DENSO Auto Parts 234-4119 for the same application. The Delphi ES10909 is a practical choice when replacing a worn front oxygen sensor on vehicles such as the Chevrolet Trailblazer and GMC Envoy.

Common Issues This Part Can Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust oxygen readings
• Reduced fuel economy from incorrect air-fuel feedback
• Failed emissions inspection tied to sensor fault codes
• Slow sensor response after cold start

Installation Notes and Tips

Verify the front sensor location, connector shape, and thread size before installation. Inspect the exhaust bung threads and wiring routing before tightening the sensor into place. Use the included instruction sheet and confirm the connector locks securely to the vehicle harness.

Quality Assurance

Delphi builds this oxygen sensor with OE heritage and application knowledge developed through long-term supplier experience with major automakers. That background supports consistent fitment and sensor performance for the listed vehicles.