Delphi ES20018 Oxygen Sensor

Delphi ES20018 Oxygen Sensor Overview

The Delphi ES20018 is a heated oxygen sensor built for precise exhaust monitoring and reliable engine management feedback. It uses a 4-wire design, a square connector, and an 18 x 1.5 mm thread size for direct-fit replacement in supported applications.

Compatible With Cadillac DeVille, Cadillac Eldorado, Cadillac Seville, Cadillac Allante, and Oldsmobile Aurora applications that call for the ES20018 configuration, including front-position use where specified.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire construction for supported vehicle electrical systems
• Square connector shape for application-specific harness connection
• 18 x 1.5 mm thread size for proper exhaust bung fitment
• 315.0 overall length for vehicles requiring this sensor length
• Front position application
• Includes oxygen sensor and instruction sheet

Detailed Description

Delphi ES20018 is an OE-style oxygen sensor backed by Delphi’s long history supplying original equipment to major automakers. The sensor is engineered for supported Cadillac and Oldsmobile applications, including 1993-1995 Cadillac Allante, 1993-1995 Cadillac Eldorado, 1993-1995 Cadillac Seville, 1994-1995 Cadillac DeVille, and 1995 Oldsmobile Aurora models that require the 315 mm overall length and front placement. This part cross-references Bosch 15702 and DENSO Auto Parts 234-4006 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the engine control module
• Slow sensor response during closed-loop operation
• Emissions test failures caused by a worn upstream sensor
• Rough idle or drivability issues tied to exhaust oxygen readings

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and 315.0 overall length before installation. Confirm front sensor placement and match the vehicle’s emission configuration, including California emissions where listed for 1994-1995 Cadillac DeVille. Inspect the exhaust bung threads and wiring routing before tightening the sensor to specification.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and engineering knowledge developed through more than a century of original equipment experience. That background supports consistent fitment and sensor performance in the applications listed for the Delphi ES20018.