Delphi ES20108 Oxygen Sensor - Rear

Delphi ES20108 Rear Oxygen Sensor

The Delphi ES20108 is a heated rear oxygen sensor built for precise exhaust monitoring on select Cadillac applications. It draws on Delphi’s OE heritage and supplier experience to deliver the fit and signal characteristics expected in aftermarket replacement service.

Key Features

• Heated oxygen sensor for faster operating temperature and stable feedback
• 4-wire design with a flat connector shape
• 18 x 1.5 mm thread size for direct-fit installation
• Overall length: 375.0
• Includes oxygen sensor and instruction sheet
• Rear position application

Detailed Description

Delphi ES20108 is an emission control sensor for the rear exhaust position on 1999-2001 Cadillac Catera models. If you are searching for a rear oxygen sensor for 1999 Cadillac Catera, 2000 Cadillac Catera, or 2001 Cadillac Catera, this part number is built to match the listed application. Delphi’s OE background is reflected in the sensor’s heated design, 4-wire configuration, and direct-fit thread specification. This part cross-references Bosch 16063 for the same application.

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the rear exhaust sensor
• Failed emissions inspection caused by a worn sensor
• Slow sensor response after extended service life
• Driveability concerns tied to inaccurate exhaust monitoring

Installation Notes and Tips

Confirm rear sensor placement before installation and verify the 18 x 1.5 mm thread size matches the exhaust bung. Inspect the connector style and wire routing against the original sensor before removal. For 1999-2001 Cadillac Catera rear oxygen sensor replacement, compare the old unit’s length and connector orientation to the Delphi ES20108 before final installation.

Quality Assurance

Delphi builds aftermarket parts using knowledge developed through long-term OE supply experience with major automakers. That OE-focused background supports consistent fitment, sensor response, and application-specific replacement performance for the Delphi ES20108.