Delphi ES10301 Oxygen Sensor - Front, Rear or Upstream

Delphi ES10301 Oxygen Sensor Overview

The Delphi ES10301 is a heated oxygen sensor built for precise exhaust monitoring in select Subaru applications. It uses a 3-wire design, square connector shape, and 18 x 1.5 mm thread size to match the specified OE-style fitment for Subaru Forester, Impreza, and Legacy models.

Backed by Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is built with the application details needed for accurate replacement service on upstream and rear positions where listed.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• 3-wire configuration
• Square connector shape
• 18 x 1.5 mm thread size
• 460.0 overall length
• Package contents include the oxygen sensor and instruction sheet
• Position-specific coverage for front, rear, and upstream applications

Detailed Description

Delphi ES10301 is an emission control sensor designed for direct replacement in confirmed Subaru fitments. It is listed for 1998 Subaru Forester rear, 1998 Subaru Impreza rear, 1993-1995 Subaru Impreza upstream, and 1990-1994 Subaru Legacy upstream. For Subaru Forester, Subaru Impreza, and Subaru Legacy service work, this part number helps match the required connector, thread, and sensor style for the application.

Delphi draws on OE experience and supplier knowledge developed over many years of original-equipment service. That background is reflected in the application-specific construction of the ES10301 oxygen sensor, making it a practical choice when replacing a worn sensor on Subaru exhaust systems.

This part cross-references DENSO Auto Parts (e.g., 234-3083, 234-3088) for the same application.

What It Is Used For

• Replacing a failed oxygen sensor that triggers a check engine light
• Correcting poor fuel control caused by inaccurate exhaust oxygen readings
• Addressing rough idle or drivability issues related to sensor signal loss
• Restoring emissions-system monitoring on Subaru Forester, Impreza, and Legacy models
• Supporting proper upstream or rear sensor operation where specified

Installation Notes and Tips

Verify the sensor position on your vehicle before ordering, since this part is listed for front, rear, and upstream locations depending on application. Confirm the connector shape, wire count, and thread size against the original sensor before installation. Use the vehicle application details to match the correct Subaru Forester, Subaru Impreza, or Subaru Legacy configuration.

Quality Assurance

Delphi builds this oxygen sensor with OE heritage and supplier experience developed through service to major automakers. The ES10301 is engineered to reflect the application requirements of the listed Subaru fitments and includes an instruction sheet in the package.