Delphi ES20026 Oxygen Sensor - Front

Delphi ES20026 Oxygen Sensor Overview

The Delphi ES20026 is a heated oxygen sensor built for front-position applications on select Ford and Mercury vehicles. It combines OE-based engineering with a 4-wire design, square connector, and 18 x 1.5 mm thread size for a direct-fit replacement on listed Contour, Cougar, and Mystique applications.

Compatible With 1995-1999 Ford Contour, 1995-1999 Mercury Mystique, and 1999 Mercury Cougar front oxygen sensor locations, this Delphi ES20026 helps restore accurate exhaust feedback for the engine management system.

• Heated oxygen sensor for faster operating temperature response
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• 630.0 overall length for listed applications
• Front position fitment on confirmed vehicles
• Package includes oxygen sensor and instruction sheet

OE-Based Design And Fitment

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers. The ES20026 is built around the specifications listed for the application, including heated sensor operation and the correct connector and thread details. This part cross-references Bosch 13115 and DENSO Auto Parts 234-4016 for the same application.

Use this Delphi ES20026 oxygen sensor when servicing front sensor locations on 1996-1999 Ford Contour, 1996-1999 Mercury Mystique, or 1999 Mercury Cougar models, as well as the listed 1995 vehicles with the same 630 mm overall length requirement.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture feedback to the engine control module
• Slow sensor response during closed-loop operation
• Emissions test failures tied to a worn front O2 sensor
• Rough idle or drivability concerns caused by inaccurate exhaust readings

Installation Notes And Tips

Verify the connector shape, wire count, thread size, and overall length before installation. Confirm front-position placement and match the vehicle’s original sensor routing to avoid fitment issues. Inspect the exhaust bung threads and wiring path before tightening the sensor, and follow the included instruction sheet during installation.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and application knowledge developed through long-term supplier experience with leading automakers. The ES20026 is engineered to meet the listed fitment and specification requirements for the confirmed Ford and Mercury applications.