Delphi ES20187 Oxygen Sensor - Rear

Delphi ES20187 Rear Oxygen Sensor

The Delphi ES20187 is a heated rear oxygen sensor built for precise exhaust monitoring on select Nissan and INFINITI applications. It uses a 4-wire design, square connector, and 18 x 1.5 mm thread size for direct-fit replacement on listed vehicles.

Key Features

• Heated oxygen sensor for rear position applications
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• Overall length: 560.0
• Package contents: oxygen sensor and instruction sheet
• Delphi OE heritage backed by 100 years of OE experience

Application Details

Compatible with rear sensor locations on select 1997-1999 Nissan Maxima, 1998-1999 Nissan Sentra, 1998 Nissan 200SX, 1997-1999 INFINITI I30, and 1999 INFINITI G20. This Delphi ES20187 oxygen sensor is also listed for 1999 Nissan Maxima without California Emission System and 1999 INFINITI I30 without California Emission System. This part cross-references Bosch 13653 for the same application.

What It Helps Address

• Check engine light related to rear oxygen sensor performance
• Incorrect exhaust oxygen readings reported to the engine control system
• Fuel trim issues caused by a worn or slow-responding sensor
• Emission test failures tied to sensor degradation
• Rough drivability concerns linked to inaccurate exhaust feedback

Installation Notes

Verify rear position fitment, connector style, and thread size before installation. Confirm whether the vehicle is equipped with California emissions equipment, since some listed applications exclude that configuration. Use the included instruction sheet and inspect the harness routing and exhaust bung condition during replacement.

Quality Assurance

Delphi builds this oxygen sensor with OE experience and supplier knowledge developed through work with major automakers. The ES20187 reflects that heritage in an aftermarket replacement intended to meet the listed application requirements.