Delphi ES20097 Oxygen Sensor - Rear Left

Delphi ES20097 Oxygen Sensor Overview

Delphi ES20097 is a heated oxygen sensor built for rear left exhaust monitoring on select GM trucks and SUVs. It combines OE heritage with application-specific fitment for 2001-2002 Chevrolet Silverado 2500 HD, Silverado 3500, Suburban 2500, and GMC Sierra 2500 HD, Sierra 3500, Yukon XL 2500, plus the 2002 Chevrolet Avalanche 2500.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design for the specified emission control application
• Triangle connector shape for direct-fit electrical connection
• 18 x 1.5 mm thread size for the listed exhaust bung specification
• 550.0 overall length for the rear left position
• Includes oxygen sensor and instruction sheet

Detailed Description

Delphi ES20097 is an emission control oxygen sensor engineered for rear left placement on the exhaust system. Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers, bringing OE-based design and manufacturing insight to this aftermarket replacement. This part cross-references Bosch 13701 for the same application. It also cross-references DENSO Auto Parts 234-4102 for the same application.

Compatible With 2002 Chevrolet Avalanche 2500, rear left; 2001-2002 Chevrolet Silverado 2500 HD, rear left; 2001-2002 Chevrolet Silverado 3500, rear left; 2001-2002 Chevrolet Suburban 2500, rear left; 2001-2002 GMC Sierra 2500 HD, rear left; 2001-2002 GMC Sierra 3500, rear left; and 2001-2002 GMC Yukon XL 2500, rear left. Use Delphi ES20097 when you need a direct replacement oxygen sensor for these rear left GM applications.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect exhaust oxygen readings at the rear left sensor location
• Slow sensor response after warm-up
• Emission control faults tied to sensor signal issues
• Driveability concerns caused by inaccurate exhaust feedback

Installation Notes and Tips

Verify the connector shape, thread size, wire count, and rear left position before installation. Inspect the exhaust bung threads and wiring routing before removing the old sensor, and confirm the replacement matches the vehicle’s original sensor location. For best results, compare the existing sensor connector and harness length to the Delphi ES20097 before final installation.

Quality Assurance

Delphi builds this oxygen sensor using OE heritage and supplier experience developed through work with leading automakers. That background supports consistent fitment and application-specific performance for the listed Chevrolet and GMC vehicles.