Delphi ES10394 Oxygen Sensor - Front or Rear

Delphi ES10394 Oxygen Sensor Overview

Delphi ES10394 is a non-heated oxygen sensor built with OE heritage from a supplier to major automakers. It uses a 2-wire design, square connector shape, and 18 x 1.5 mm thread size for direct-fit replacement in supported Toyota applications.

Compatible With select Toyota Celica, Paseo, Tercel, and RAV4 applications, this oxygen sensor is specified for front and rear positions depending on vehicle configuration. Delphi ES10394 is a practical choice when you need accurate exhaust feedback on a Toyota Celica oxygen sensor replacement or a Toyota RAV4 front sensor service.

Key Features

• Brand: Delphi
• Part number: ES10394
• Sensor type: Non Heated
• Wire quantity: 2
• Connector shape: Square
• Thread size: 18 x 1.5 mm
• Overall length: 300.0
• Package contents: Oxygen sensor, instruction sheet
• Position coverage: Front and rear, depending on application

Detailed Description

Delphi ES10394 is an emission control oxygen sensor designed for vehicles that use a non-heated, 2-wire sensor layout. The square connector and 18 x 1.5 mm thread size support OE-style fitment, while the 300.0 overall length helps match the original routing on the vehicle. This part number is listed for 1994-1999 Toyota Celica, 1997-1998 Toyota Paseo, 1997-1998 Toyota Tercel, and 1996-1997 Toyota RAV4 applications, with position-specific coverage that varies by model and emissions package.

This part cross-references Bosch 12108 and DENSO Auto Parts 234-2010 for the same application. Delphi ES10394 is built from the company’s long OE background, bringing production knowledge into an aftermarket oxygen sensor replacement for Toyota Celica, Toyota Tercel, and Toyota RAV4 service work.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect exhaust oxygen readings affecting fuel control
• Rough idle or drivability concerns tied to sensor signal issues
• Failed emissions inspection caused by a worn sensor
• Restoration of proper sensor feedback on front or rear exhaust locations

Installation Notes and Tips

Verify the vehicle’s exact year, engine setup, and emissions configuration before ordering. Fitment includes 1999 Toyota Celica front, 1998 Toyota Celica rear, 1995 Toyota Celica rear, 1997-1998 Toyota Paseo front, 1997-1998 Toyota Tercel front, 1996-1997 Toyota Celica rear with California Emission System, 1994 Toyota Celica rear with California Emission System, 1997 Toyota RAV4 front without California Emission System, and 1996 Toyota RAV4 front. Match the connector shape, thread size, and sensor position to the original part before installation.

Quality Assurance

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers. That background is reflected in the design and application coverage of ES10394 for supported Toyota oxygen sensor replacements.