Delphi ES20099 Oxygen Sensor - Rear Left or Rear Right

Delphi ES20099 Oxygen Sensor Overview

The Delphi ES20099 is a heated oxygen sensor built for rear left and rear right applications on select Nissan and INFINITI vehicles. It combines OE-based engineering with a 4-wire design, square connector, and 18 x 1.5 mm thread size for a direct-fit replacement on listed applications.

Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers, bringing that background into this aftermarket oxygen sensor. For drivers searching for a rear oxygen sensor for a 2001 Nissan Maxima, 2000-2001 INFINITI I30, or 2002 Nissan Sentra, this part number ES20099 is built to match the specified position and connector requirements.

Key Features

• Heated oxygen sensor for faster operating response
• 4-wire design for listed rear sensor applications
• Square connector shape for proper electrical connection
• 18 x 1.5 mm thread size
• Overall length: 920.0
• Includes oxygen sensor and instruction sheet
• Position-specific coverage for rear left and rear right locations

Detailed Description

Delphi ES20099 is an emission control sensor used to monitor exhaust oxygen content on the rear side of the exhaust system. It is listed for rear right and rear left positions on select 1999-2002 Nissan Maxima, 1999-2002 Nissan Sentra, and 1999-2001 INFINITI I30 applications, with notes that vary by emission package and model year. This oxygen sensor is a practical OE-style replacement when the original sensor has aged, triggered a fault code, or no longer provides stable feedback to the engine management system.

This part cross-references Bosch 13348 and DENSO Auto Parts 234-4777 for the same application. Delphi ES20099 is a direct search match for buyers looking for a rear oxygen sensor for Nissan Maxima, Nissan Sentra, or INFINITI I30 vehicles within the listed fitment.

What It Helps Address

• Check engine light related to rear oxygen sensor performance
• Fault codes tied to slow sensor response or heater circuit issues
• Incorrect exhaust feedback on listed Nissan and INFINITI applications
• Rough emissions monitoring after sensor aging or contamination
• Replacement needs for rear left or rear right sensor positions

Installation Notes and Tips

Confirm the exact vehicle application, model year, emission package, and sensor position before ordering. Fitment includes rear left and rear right locations depending on the vehicle, so verify the Application tab for the correct side on your specific Nissan Maxima, Nissan Sentra, or INFINITI I30. Match the connector shape, wire count, and thread size to the original sensor before installation.

For best results, inspect the harness and connector for heat damage or corrosion before installing the new sensor. Use the listed position and notes to avoid ordering the wrong rear oxygen sensor for vehicles with California Emission System or Mid Year Emissions differences.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and engineering knowledge developed through long-term supplier experience with major automakers. That background supports consistent fitment and sensor design for the applications listed for ES20099.