Delphi ES10003 Oxygen Sensor - Front

Delphi ES10003 Oxygen Sensor Overview

The Delphi ES10003 is a front oxygen sensor built for vehicles that use a non-heated, 2-wire design with a flat connector and 18 x 1.5 mm thread size. It reflects Delphi’s OE heritage, drawing on decades of original-equipment experience used by major automakers.

Compatible with select Cadillac applications including DeVille, Eldorado, Seville, Fleetwood, Allante, Commercial Chassis, and 60 Special, this sensor is specified for models that call for a 375 mm overall length. The Delphi ES10003 is a direct-fit emission control replacement for the listed front sensor applications.

Key Features

• Part number: ES10003
• Front oxygen sensor position
• Non-heated 2-wire design
• Flat connector shape
• 18 x 1.5 mm thread size
• 375.0 mm overall length
• Includes oxygen sensor and instruction sheet
• Built with Delphi OE experience and aftermarket application knowledge

Detailed Description

Delphi ES10003 is an emission control oxygen sensor engineered for front placement on select Cadillac vehicles. It is specified for 1987-1995 Cadillac applications that require a non-heated sensor with a flat connector and 375 mm overall length, including 1988-1993 Cadillac DeVille, 1987-1993 Cadillac Eldorado, 1988-1993 Cadillac Seville, 1987-1992 Cadillac Allante, 1988-1992 Cadillac Fleetwood, 1988-1993 Cadillac Commercial Chassis, and 1993 Cadillac 60 Special. It also fits 1994-1995 Cadillac DeVille without California Emission System.

This oxygen sensor helps maintain proper exhaust feedback for the engine management system. This part cross-references DENSO Auto Parts 234-2001 and Bosch 12028 for the same application.

What It Helps Address

• Fault codes related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Fuel mixture issues from a worn front sensor
• Failed emissions testing tied to sensor degradation
• Reduced drivability from delayed air-fuel correction

Installation Notes and Tips

Verify the vehicle uses a front, non-heated oxygen sensor with a 375 mm overall length, 2-wire layout, flat connector, and 18 x 1.5 mm thread before installation. Confirm the application against the exact Cadillac model and emission configuration, especially for 1994-1995 DeVille models without California Emission System. Use the included instruction sheet during installation and inspect the connector and harness routing before final tightening.

Quality Assurance

Delphi builds this replacement part using OE experience and knowledge developed through supplying original equipment to major automakers. That background is applied to the ES10003 to support accurate fitment and dependable emission-system service on the listed Cadillac applications.