Delphi ES20025 Oxygen Sensor - Front

Delphi ES20025 Oxygen Sensor Overview

The Delphi ES20025 is a heated oxygen sensor built for front-position applications on select Ford and Mercury vehicles. It draws on Delphi’s OE heritage and decades of supplier experience to deliver the sensor specifications needed for accurate exhaust feedback and emissions system operation.

Compatible With 1995-1999 Ford Contour and Mercury Mystique, plus 1999 Mercury Cougar front applications with 375mm overall length.

Key Features

• Heated oxygen sensor for faster operating temperature
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for direct-thread mounting
• 375.0 overall length for listed front applications
• Package contents include the oxygen sensor and instruction sheet
• Delphi ES20025 cross-references Bosch 13115 and DENSO 234-4607 for the same application

Detailed Description

Delphi ES20025 is an emission control oxygen sensor engineered for front placement on select 1995-1999 Ford Contour, 1995-1996 Mercury Mystique, and 1999 Mercury Cougar vehicles. The heated design helps the sensor reach operating temperature quickly, supporting stable exhaust-gas feedback for the engine control system. With a 4-wire layout, square connector, and 18 x 1.5 mm thread size, this Delphi oxygen sensor matches the listed OE-style fitment requirements for the application.

Delphi’s OE background is reflected in the sensor’s construction and application-specific design. The ES20025 part number is also referenced in aftermarket catalogs under Delphi ES20025, making it a practical replacement choice when servicing front oxygen sensor faults on these Ford and Mercury models.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Fuel trim issues from a slow or failing front sensor
• Emissions test failures tied to sensor response problems
• Reduced drivability from degraded air-fuel mixture control

Installation Notes

Verify the vehicle’s front sensor location, connector style, thread size, and 375mm overall length before installation. This Delphi ES20025 oxygen sensor is listed for front positions only, including 1996-1999 Ford Contour front, 1996-1998 Mercury Mystique front, and 1999 Mercury Cougar front with 375mm overall length. Use the included instruction sheet and confirm the connector routing matches the original harness before tightening the sensor.

Quality Assurance

Delphi builds this sensor from OE experience and supplier knowledge developed over many years supporting major automakers. That OE heritage is applied to the ES20025 to help maintain the fit, function, and electrical characteristics expected for the listed Ford and Mercury applications.