Delphi ES20186 Oxygen Sensor - Rear Right
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Delphi

Delphi ES20186 Oxygen Sensor - Rear Right

Brand Delphi ES20186
Position Rear Right
Connector Shape Square
Overall Length 380.0
Package Contents Oxygen Sensor, Instruction Sheet
Position(s) Front, Rear Right. For the position specific to your vehicle, refer to the Application tab.
Sensor Type Heated
Thread Size 18 x 1.5 mm
Wire Quantity 4
Fits Mazda · 5 vehicles

Heated sensor. Helps the oxygen sensor reach operating temperature quickly.

Square connector. Simplifies matching the electrical connection during installation.

OE heritage. Built with 100 years of OE experience and supplier knowledge.

Cross-references BBB Industries 11083, Bosch 15429 and Carlson 13366 for the same application. See all 23.

$100.12Free shipping
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Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Oxygen Sensor options

Delphi ES20186 Oxygen Sensor Overview

The Delphi ES20186 is a heated oxygen sensor built for precise exhaust monitoring and OE-style replacement performance. It draws on Delphi’s long OE heritage and supplier experience, with application coverage for select Mazda 6 and Mazda 929 models.

  • Heated oxygen sensor for faster operating temperature and stable signal output
  • 4-wire design with square connector shape
  • 18 x 1.5 mm thread size for the listed applications
  • Overall length: 380.0
  • Package contents: oxygen sensor and instruction sheet
  • Position-specific coverage for front, rear right, and N/A applications as listed

Fitment and Application Details

Compatible with 2003-2005 Mazda 6, rear right, and 1990-1991 Mazda 929, N/A. The Delphi ES20186 is a direct-fit oxygen sensor option for these vehicle applications, and the part number ES20186 is commonly referenced when matching the correct sensor by position.

This part cross-references Bosch 15429 and DENSO Auto Parts 234-4040 for the same application.

What This Oxygen Sensor Helps Address

  • Check engine light concerns related to oxygen sensor performance
  • Incorrect air-fuel ratio readings from a worn upstream or downstream sensor
  • Reduced fuel economy caused by inaccurate exhaust feedback
  • Emissions test failures tied to sensor response issues
  • Rough idle or drivability problems associated with faulty exhaust monitoring

Installation Notes

Verify the exact position on your vehicle before ordering, since this sensor is listed for front, rear right, and N/A applications depending on fitment. Confirm the 4-wire square connector, 18 x 1.5 mm thread size, and overall length of 380.0 against the original sensor before installation. Use the included instruction sheet and follow the vehicle service procedure for proper routing and connector engagement.

Quality Assurance

Delphi builds aftermarket parts using OE experience and knowledge developed through decades of supplying major automakers. That OE-based background is reflected in the ES20186 oxygen sensor’s construction and application-specific fitment.

Related reading

This part fits 5 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
2005Mazda6—Rear Right—
2004Mazda6—Rear Right—
2003Mazda6—Rear Right—
1991Mazda929SN/A—
1990Mazda929SN/A—
Directly replaces or cross-references 23 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 11083Bosch — 15429Carlson — 13366DENSO Auto Parts — 234-4040Four Seasons — 24015Gates — 22097138-343234-40862131275213137925024086AJ60-18-861AAJ60-18-861BJE26-18-861AJE26-18-861BJE26-18-861B9UOS879REA1361REA1622SG136SG1041SU4600SU6825