Delphi ES10366 Oxygen Sensor - Front or Right

OE-Style Oxygen Sensor for Mazda and Kia

Delphi ES10366 is a heated oxygen sensor built for precise exhaust monitoring on select Mazda and Kia applications. With OE heritage behind the design, this sensor supports accurate air-fuel feedback for vehicles such as the Mazda 626, Mazda Protege, Kia Sephia, and Mazda MX-3.

• Heated oxygen sensor for faster operating temperature
• 3-wire design with square connector shape
• 18 x 1.5 mm thread size for the specified application
• Overall length: 375.0
• Package includes the oxygen sensor and instruction sheet
• Position-specific coverage for front and right applications where listed

Detailed Product Overview

The Delphi ES10366 oxygen sensor is engineered for vehicles that rely on accurate exhaust oxygen readings to manage fuel delivery and emissions performance. Delphi draws on OE experience and supplier knowledge developed over decades of original-equipment service, bringing that background into this aftermarket replacement part. This part number, ES10366, is a direct-fit style solution for select front and right-side applications, including 1998-1999 Mazda 626 front with California Emission System, 1995-1998 Mazda Protege front, 1996-1997 Kia Sephia front, 1995 Kia Sephia, 1994-1995 Mazda MX-3, and 1994 Mazda MX-3 right with California Emission System.

This part cross-references Bosch 13362 and DENSO Auto Parts 234-3085 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect fuel mixture readings from a worn upstream sensor
• Reduced emissions control response on monitored exhaust systems
• Rough idle or drivability issues tied to inaccurate exhaust feedback
• Slow sensor response during warm-up on heated sensor applications

Installation Notes and Tips

Confirm the vehicle’s exact year, make, model, and sensor position before ordering, since this listing includes front and right applications only where specified. Match the 3-wire connector, square plug shape, and 18 x 1.5 mm thread size to the original sensor before installation. For the Mazda 626, Mazda Protege, Kia Sephia, and Mazda MX-3 applications listed above, verify California Emission System notes where shown in the fitment data.

Quality Assurance

Delphi builds this replacement oxygen sensor using OE-focused engineering knowledge developed through long-term supplier experience with major automakers. That OE background is reflected in the sensor design, connector style, and application-specific fitment support for ES10366.