Delphi ES20395 Oxygen Sensor - Rear Left

Delphi ES20395 Oxygen Sensor for Rear Left Applications

The Delphi ES20395 is a heated oxygen sensor built for rear left placement 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 direct-fit replacement service.

Compatible With 2001-2003 INFINITI QX4 and 2001-2002 Nissan Pathfinder rear left applications, this Delphi oxygen sensor supports accurate exhaust monitoring on the vehicles listed below. The ES20395 is a practical choice when replacing a worn rear oxygen sensor on a Nissan Pathfinder or INFINITI QX4.

Key Features

• Heated oxygen sensor for rear left placement
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• Overall length: 1240.0
• Package contents: oxygen sensor and instruction sheet
• OE-based design backed by Delphi’s long history supplying original equipment to major automakers

Detailed Description

Delphi ES20395 is engineered for rear left exhaust sensor service on 2001-2003 INFINITI QX4 and 2001-2002 Nissan Pathfinder models. Delphi draws on OE heritage and manufacturing knowledge developed over decades of original equipment supply, bringing that experience into this aftermarket oxygen sensor. The heated design helps the sensor reach operating temperature quickly, while the 4-wire layout and square connector support straightforward replacement on the listed applications.

This part cross-references Bosch 13651 and DENSO Auto Parts 234-4713 for the same application. The ES20395 is also referenced by several other aftermarket numbers, making it easier to match the correct rear left oxygen sensor for your vehicle.

What It Is Used For

• Replacing a failed rear left oxygen sensor on a Nissan Pathfinder
• Replacing a rear left oxygen sensor on an INFINITI QX4
• Restoring exhaust feedback signal accuracy for engine management
• Addressing oxygen sensor fault codes related to rear sensor performance
• Correcting drivability issues tied to aging exhaust sensor response

Installation Notes and Tips

Verify rear left placement before ordering, since oxygen sensors are position-specific. Confirm the 18 x 1.5 mm thread size and square connector match the original sensor on the vehicle. For 2001 INFINITI QX4, note the mid-year emissions application; for 2001 Nissan Pathfinder, confirm the build date from 08/2000. Inspect the harness routing and connector condition before installation, and compare the sensor lead length to the original unit.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and supplier knowledge developed through work with major automakers. The ES20395 is intended to meet the fitment and configuration requirements of the listed vehicles and positions.