Delphi ES20386 Oxygen Sensor - Front

Delphi ES20386 Oxygen Sensor for Mazda 6

The Delphi ES20386 is a heated oxygen sensor built for front-position applications on select Mazda 6 models. It draws on Delphi’s OE heritage and decades of supplier experience to deliver the sensor specifications needed for accurate exhaust feedback and emissions system operation.

Key Features

• Heated oxygen sensor for faster operating temperature
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for the listed application
• Overall length: 655.0
• Includes oxygen sensor and instruction sheet
• Front position fitment for select Mazda 6 applications

Detailed Description

Delphi ES20386 is an emission control sensor engineered for front placement on 2003-2005 Mazda 6 models, including 2005 Mazda 6 without California Emission System. As a heated oxygen sensor, it helps the engine management system monitor exhaust oxygen content more quickly after startup, supporting proper fuel control and emissions performance. Delphi’s OE background is reflected in the sensor’s construction and application-specific design.

This part cross-references Bosch 15427 for the same application. It also cross-references DENSO Auto Parts 234-4399 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the exhaust stream
• Slow sensor response during warm-up
• Emissions test failures tied to front sensor faults
• Rough idle or drivability issues caused by inaccurate exhaust readings

Installation Notes and Tips

Fits 2003-2005 Mazda 6, front. Fits 2005 Mazda 6, front, without California Emission System. Confirm connector shape, thread size, wire count, and sensor position before installation. Use the included instruction sheet and verify the exhaust bung threads are clean and undamaged before threading in the sensor.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and supplier knowledge developed through work with major automakers. The ES20386 is made to match the listed application requirements for front-position use on the specified Mazda 6 models.