Delphi ES20143 Oxygen Sensor - Rear

Delphi Rear Heated Oxygen Sensor

The Delphi ES20143 is a rear heated oxygen sensor built for precise exhaust monitoring and OE-style replacement performance. It uses a 4-wire design, square connector, and 18 x 1.5 mm thread size for direct-fit service on listed applications, including Mercury Villager and Nissan Quest rear positions.

Key Features

• Heated oxygen sensor for rear exhaust placement
• 4-wire configuration with square connector shape
• 18 x 1.5 mm thread size
• Overall length: 1290.0
• Package contents: oxygen sensor and instruction sheet
• Delphi ES20143 replacement part number for OE-style service

Detailed Description

Delphi ES20143 is engineered from Delphi’s OE heritage and aftermarket experience, drawing on supplier knowledge developed through work with major automakers. As a rear oxygen sensor, it monitors exhaust output after the catalytic converter and supports accurate feedback for the engine management system. This makes it a direct replacement choice for 1996-1998 Mercury Villager rear and 1996-1997 Nissan Quest rear applications. The Delphi ES20143 also cross-references Bosch 13591 and DENSO Auto Parts 234-4702 for the same application.

What It Helps Address

• Check engine light related to rear oxygen sensor faults
• Incorrect exhaust feedback readings from a worn sensor
• Reduced fuel control accuracy caused by aging sensor response
• Emission system fault codes tied to rear sensor performance
• Replacement needs for Mercury Villager and Nissan Quest rear sensor service

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and rear position before installation. Confirm the sensor routing and overall length match the original layout on the vehicle. Use the included instruction sheet during installation, and inspect the exhaust bung threads for damage before threading in the new sensor. This part is listed for 1996-1998 Mercury Villager rear and 1996-1997 Nissan Quest rear applications.

Quality Assurance

Delphi builds this sensor using OE experience and supplier knowledge developed over more than a century of automotive engineering. That background is reflected in the ES20143 replacement design for rear oxygen sensor service on Mercury Villager and Nissan Quest applications.