Delphi ES20363 Oxygen Sensor - Rear Left or Rear Right

Delphi ES20363 Oxygen Sensor Overview

The Delphi ES20363 is a heated oxygen sensor built for rear sensor locations on select Infiniti and Nissan 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 vehicles that require this configuration.

Built with Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is specified for rear, rear left, and rear right positions depending on the vehicle application. The Delphi ES20363 is a practical choice for restoring accurate exhaust feedback on Infiniti I35, Infiniti QX4, Nissan Maxima, Nissan Pathfinder, and Nissan Sentra applications listed below.

Key Features

• Heated oxygen sensor for rear exhaust monitoring
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for listed applications
• Overall length: 800.0
• Includes oxygen sensor and instruction sheet
• Position-specific fitment for rear, rear left, and rear right locations
• Cross-references select OE and aftermarket part numbers for the same application, including Bosch 13650 and DENSO 234-4241

Detailed Description

Delphi ES20363 is engineered for vehicles that require a heated rear oxygen sensor with the listed connector and thread specifications. It is used in rear sensor positions on 2001-2004 Infiniti and Nissan models, including 2002-2004 Infiniti I35 rear left, 2002-2003 Infiniti QX4 rear right, 2002-2003 Nissan Maxima rear left, 2002 Nissan Pathfinder rear right, 2002 Nissan Sentra rear right, 2001 Infiniti QX4 rear right with mid year emissions, 2001 Nissan Pathfinder rear right from 08/2000, and 2001 Nissan Sentra rear right without California Emission System; Mid Year Emissions.

For shoppers searching for a rear oxygen sensor for Nissan Maxima, Infiniti QX4 oxygen sensor replacement, or a Delphi ES20363 direct-fit sensor, this part matches the listed vehicle and position requirements. Delphi’s OE background supports consistent fitment and sensor construction for the applications shown.

What This Sensor Helps Address

• Check engine light related to rear oxygen sensor performance
• Incorrect exhaust oxygen feedback to the engine control system
• Emissions test failures tied to a faulty rear sensor
• Rough fuel control caused by inaccurate sensor readings
• Replacement needs for worn or aging rear O2 sensor units

Installation Notes and Tips

Confirm the exact position before ordering, since this part is listed for rear left and rear right applications depending on the vehicle. Match the connector shape, wire count, and thread size to the original sensor before installation. Review the application tab for vehicle-specific position details, especially on 2001-2004 Infiniti I35, Infiniti QX4, Nissan Maxima, Nissan Pathfinder, and Nissan Sentra models.

Quality Assurance

Delphi builds this sensor with OE experience and supplier knowledge developed over many years in the automotive industry. That background is reflected in the part’s application-specific design and the included instruction sheet for installation reference.