Delphi ES20209 Oxygen Sensor - Front, Rear or Rear Right

Delphi ES20209 Oxygen Sensor Overview

Delphi ES20209 is a heated oxygen sensor built for precise exhaust monitoring and OE-style replacement performance. Backed by Delphi’s century of original equipment experience, it brings application-specific engineering to emissions control service on select Acura and Honda models.

Compatible With 2000-2005 Acura NSX rear right, 2001-2003 Honda Civic rear, and 1998-2001 Honda Prelude front applications. The Delphi ES20209 oxygen sensor is designed with a 4-wire heated layout, square connector shape, and 18 x 1.5 mm thread size for direct-fit service where specified.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design for application-specific emissions system integration
• Square connector shape for OE-style electrical connection
• 18 x 1.5 mm thread size for proper exhaust bung fitment
• Overall length: 480.0
• Package contents include the oxygen sensor and instruction sheet
• Position coverage includes front, rear, and rear right applications

Detailed Description

Delphi ES20209 is an emission control sensor engineered for vehicles that rely on accurate oxygen feedback to manage fuel delivery and catalyst efficiency. Delphi’s OE heritage is reflected in the sensor design, helping maintain the signal quality expected in factory-style exhaust management systems. This part number, ES20209, is listed for select Acura NSX, Honda Civic, and Honda Prelude applications, making it a focused replacement choice for specific front and rear sensor locations.

This part cross-references Bosch 13534 and DENSO Auto Parts 234-4094 for the same application.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn sensor
• Reduced catalyst monitoring accuracy
• Slow sensor response in heated exhaust systems
• Emissions test failures tied to sensor degradation

Installation Notes and Tips

• Verify the exact sensor position before ordering; this part is listed for front, rear, and rear right locations depending on vehicle application.
• Confirm connector shape, wire count, and thread size against the original sensor before installation.
• Inspect the exhaust bung threads and wiring routing before tightening the sensor.
• Use the vehicle application details to match the correct Acura NSX, Honda Civic, or Honda Prelude placement.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and supplier knowledge developed through service to major automakers. The ES20209 is engineered as an aftermarket replacement with factory-style fitment details for the listed applications.