Delphi ES10944 Oxygen Sensor - Front

Front Oxygen Sensor for Toyota Applications

Delphi ES10944 is a front oxygen sensor built for specific Toyota Tacoma, Tundra, and 4Runner applications. It uses a 4-wire layout, square connector shape, and 18 x 1.5 mm thread size for direct replacement service on listed vehicles.

Key Features

• Front-position oxygen sensor for listed Toyota applications
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size
• Overall length: 310.0
• Package contents: oxygen sensor and instruction sheet
• Delphi ES10944 part number for catalog matching

OE Heritage and Build Approach

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers. That background is reflected in the ES10944 oxygen sensor, which is built to match the electrical and physical requirements of the listed front air-fuel ratio sensor applications on Toyota Tacoma, Toyota Tundra, and Toyota 4Runner models.

This part cross-references DENSO Auto Parts (e.g., 234-9001, 234-9002) for the same application.

Vehicle Fitment

• Fits 2001-2004 Toyota Tacoma, front; Air-Fuel Ratio Sensor
• Fits 2001-2004 Toyota Tundra, front; Air-Fuel Ratio Sensor
• Fits 2001-2002 Toyota 4Runner, front; Air-Fuel Ratio Sensor
• Fits 2000-2001 Toyota Tacoma, front; with California Emission System; Air-Fuel Ratio Sensor
• Fits 1999-2000 Toyota 4Runner, front; with California Emission System; Air-Fuel Ratio Sensor
• Fits 2000 Toyota Tundra, front; with California Emission System; Air-Fuel Ratio Sensor

Common Replacement Reasons

• Check engine light related to oxygen sensor or air-fuel ratio sensor faults
• Rough idle or inconsistent fuel trim readings
• Reduced fuel economy from inaccurate exhaust feedback
• Emission test failure caused by sensor response issues
• Front sensor replacement on Toyota Tacoma, Tundra, or 4Runner

Installation Notes

Verify connector shape, thread size, wire count, and front position before installation. Confirm the vehicle’s emission system configuration, especially California Emission System applications, and match the sensor to the exact Toyota model year listed above. Use the included instruction sheet during replacement and inspect the harness routing and connector lock before final assembly.

Quality Assurance

Delphi builds this sensor using OE-based engineering knowledge developed through long-term supplier experience with major automakers. The ES10944 is cataloged for direct-fit service on the specified Toyota front air-fuel ratio sensor applications.