Delphi ES20159 Oxygen Sensor - Front, Rear, Rear Left or Rear Right

Delphi ES20159 Oxygen Sensor Overview

The Delphi ES20159 is a heated oxygen sensor built for emission control applications that require accurate exhaust feedback and reliable signal response. It draws on Delphi’s OE heritage and supplier experience, with aftermarket construction informed by original equipment knowledge.

Use this oxygen sensor for select Hyundai Sonata, Hyundai XG300, Hyundai XG350, and Kia Sedona applications listed below. The Delphi ES20159 is a direct-fit style replacement for vehicles that use a 4-wire, square-connector sensor with an 18 x 1.5 mm thread.

Key Features

• Heated oxygen sensor for faster operating temperature and stable exhaust monitoring
• 4-wire design for signal and heater circuit operation
• Square connector shape for application-specific fitment
• 18 x 1.5 mm thread size
• Overall length: 820.0
• Package contents: oxygen sensor and instruction sheet
• Position coverage includes front, rear, rear left, and rear right depending on vehicle application

Detailed Description

Delphi ES20159 is engineered for emission control systems that rely on precise oxygen sensing to help the engine control module manage air-fuel feedback. It is listed for 1997-1998 Hyundai Sonata with California Emission System in front and rear positions, 2001 Hyundai XG300 rear left, 2002 Hyundai XG350 rear left, 2003 Hyundai XG350 rear left to 02/01/2003, and 2002-2005 Kia Sedona rear left and rear right. This part number, ES20159, is also cross-referenced in the aftermarket under select replacement numbers for the same application.

Delphi’s OE background is reflected in the sensor’s application-specific design and fitment focus. For buyers searching for a Hyundai Sonata oxygen sensor, Kia Sedona rear oxygen sensor, or Hyundai XG350 rear left oxygen sensor, this part provides a targeted replacement option for the listed vehicles.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn upstream or downstream sensor
• Slow sensor response after warm-up
• Emission test failures tied to sensor output
• Rough idle or drivability concerns caused by inaccurate exhaust readings

Installation Notes and Tips

Confirm the exact position on your vehicle before ordering, since ES20159 is listed for front, rear, rear left, and rear right locations depending on application. Verify the connector shape, wire count, and thread size against the original sensor before installation. Use the vehicle application data to match the correct Hyundai Sonata, Hyundai XG300, Hyundai XG350, or Kia Sedona fitment, and follow the included instruction sheet during replacement.

Quality Assurance

Delphi builds this sensor with OE-based engineering knowledge developed through long-term supplier experience with major automakers. That background supports consistent fitment and emission-system service for the listed applications.