Delphi ES20190 Oxygen Sensor - Rear Left or Rear Right

Delphi ES20190 Oxygen Sensor Overview

The Delphi ES20190 is a heated oxygen sensor built for rear-bank exhaust monitoring on select Infiniti and Nissan applications. It uses OE-based engineering from Delphi’s long history supplying automakers, with the fitment and connector details needed for a direct replacement on the listed vehicles.

• Heated oxygen sensor for rear left and rear right positions
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size
• Overall length: 1005.0
• Package contents: oxygen sensor and instruction sheet
• Direct-fit application coverage for select Infiniti I30, Infiniti QX4, Nissan Maxima, and Nissan Pathfinder models

Fitment and Application Details

Compatible with 1999 Infiniti I30, rear left, with California Emission System; 2000-2001 Infiniti I30, rear right; 2001 Infiniti QX4, rear right, except Mid Year Emissions; 1999 Nissan Maxima, rear left, with California Emission System; 2000 Nissan Maxima, rear right, with California Emission System; and 2001 Nissan Pathfinder, rear right, to 08/2000. The Delphi ES20190 is a practical OE-style replacement when servicing rear oxygen sensor circuits on these vehicles.

This part cross-references Bosch (e.g., 13374, 15377) for the same application.

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 sensor response issues
• Rough or inconsistent fuel control caused by aging sensor output
• Fault codes associated with rear sensor heater or signal problems

Installation Notes

Verify the position on your vehicle before ordering, since this part is listed for rear left and rear right locations depending on application. Confirm the 18 x 1.5 mm thread size, 4-wire configuration, square connector shape, and overall length against the original sensor before installation. Use the included instruction sheet and follow the vehicle service procedure for proper routing and connector engagement.

Quality Assurance

Delphi draws on OE heritage and more than 100 years of experience supplying parts to major automakers, and that engineering background is reflected in the ES20190 replacement sensor.