Delphi ES10718 Oxygen Sensor - Rear
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Delphi

Delphi ES10718 Oxygen Sensor - Rear

Brand Delphi ES10718
Position Rear
Connector Shape Square
Overall Length 1015.0
Package Contents Oxygen Sensor, Instruction Sheet
Sensor Type Heated
Thread Size 18 x 1.5 mm
Wire Quantity 4
Fits Mazda · 4 vehicles

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

Square connector. Designed for a secure electrical connection.

OE heritage. Built with Delphi's century of original-equipment experience.

Cross-references Bosch 13850, DENSO Auto Parts 234-4037 and Gates 22095 for the same application. See all 16.

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Delphi ES10718 Rear Oxygen Sensor

The Delphi ES10718 is a heated rear oxygen sensor built for precise exhaust monitoring on select applications. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size, making it a direct-fit replacement for the rear sensor location on 1997-2000 Mazda Millenia models located behind the catalytic converter.

Key Features

  • Heated oxygen sensor for faster operating temperature and stable signal output
  • 4-wire configuration with square connector shape
  • 18 x 1.5 mm thread size for proper exhaust bung fitment
  • Overall length: 1015.0
  • Rear position sensor for the exhaust stream behind the catalytic converter
  • Includes oxygen sensor and instruction sheet

Fitment and Application

Fits 1997-2000 Mazda Millenia, rear. This Delphi ES10718 oxygen sensor is also referenced for Mazda Millenia rear sensor replacement searches, including 1997 Mazda Millenia rear oxygen sensor and 2000 Mazda Millenia rear O2 sensor applications.

Delphi builds this part using OE heritage and knowledge developed from supplying top automakers for decades. That background is reflected in the sensor design, connector style, and thread specification used for accurate replacement on the Mazda Millenia rear exhaust position.

This part cross-references Bosch 13850 and DENSO Auto Parts 234-4037 for the same application.

What It Helps Address

  • Check engine light related to rear oxygen sensor performance
  • Incorrect exhaust feedback after the catalytic converter
  • Slow sensor response from a worn heated O2 sensor
  • Emissions test failures tied to rear sensor readings
  • Fuel control issues caused by inaccurate exhaust data

Installation Notes and Quality Assurance

Verify the rear sensor location, connector shape, thread size, and wire count before installation. On Mazda Millenia applications, this sensor installs behind the catalytic converter and should be matched to the original harness routing and exhaust bung specification. Delphi’s OE-focused manufacturing approach supports consistent fit and function for replacement use.

Quality assurance is supported by Delphi’s long OE supply background and aftermarket engineering based on original equipment knowledge.

Related reading

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2000MazdaMilleniaRearLocated Behind Catalytic Converter
1999MazdaMilleniaRearLocated Behind Catalytic Converter
1998MazdaMilleniaRearLocated Behind Catalytic Converter
1997MazdaMilleniaRearLocated Behind Catalytic Converter
Directly replaces or cross-references 16 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 13850DENSO Auto Parts — 234-4037Gates — 22095138-724156-433621313682131409213144125024160KLL6-18-861KLL6-18-861AKLL6-18-861BKLL6-18-861COS1005SG1033SU4580