Delphi ES10938 Oxygen Sensor - Front

Front Oxygen Sensor for Subaru Impreza, Legacy, Outback

Delphi ES10938 is a front oxygen sensor built for select 1999-2001 Subaru applications, including Impreza, Legacy, and Outback models. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size for direct replacement service.

Key Features

• Front oxygen sensor for emission control system service
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• 380.0 overall length
• Package contents include the oxygen sensor and instruction sheet
• Fits 2000-2001 Subaru Impreza, front
• Fits 2000-2001 Subaru Legacy, front
• Fits 2000-2001 Subaru Outback, front
• Fits 1999 Subaru Impreza, front, with California Emission System
• Fits 1999 Subaru Legacy, front, with California Emission System

Detailed Description

Delphi ES10938 is an OE-style oxygen sensor for the front position on select Subaru vehicles. Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers, bringing that engineering background into this aftermarket replacement part. This sensor is specified for 2000-2001 Subaru Impreza, Legacy, and Outback models, plus 1999 Subaru Impreza and Legacy vehicles equipped with the California Emission System.

This part cross-references Bosch 17018 and DENSO Auto Parts 234-9018 for the same application. It is a direct-fit option for Subaru Impreza front oxygen sensor replacement, Subaru Legacy front O2 sensor service, and Subaru Outback front sensor applications.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Emissions test failures tied to front sensor faults
• Rough idle or drivability issues caused by inaccurate exhaust feedback
• Slow or inconsistent sensor response

Installation Notes and Tips

• Verify the connector shape, wire count, thread size, and front position before installation.
• Confirm California Emission System coverage on 1999 Subaru Impreza and Legacy models.
• Inspect the harness routing and connector condition before connecting the new sensor.
• Use the included instruction sheet during installation.

Quality Assurance

Delphi builds this oxygen sensor using OE heritage and application knowledge developed through long-term supplier experience with leading automakers. That background supports consistent fitment and service replacement for Subaru emission control repairs.