Delphi ES20218 Oxygen Sensor - Center or Rear

Delphi ES20218 Oxygen Sensor Overview

The Delphi ES20218 oxygen sensor is a heated replacement sensor built for precise exhaust monitoring and reliable feedback to the engine control system. It is a direct-fit option for select Nissan Altima and INFINITI G20 applications, including center and rear positions.

With OE-based engineering informed by Delphi’s long history supplying automakers, this sensor is built to match the demands of everyday drivability, emissions control, and fuel management.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design for modern engine management systems
• Square connector shape for application-specific fitment
• 18 x 1.5 mm thread size for direct exhaust installation
• Overall length: 365.0
• Includes oxygen sensor and instruction sheet
• Compatible with center and rear sensor positions, depending on vehicle application

Detailed Description

Delphi ES20218 is an OE-style oxygen sensor engineered for accurate exhaust gas feedback in select 2001-2004 Nissan Altima and 2001-2002 INFINITI G20 applications. It supports emissions control by helping the engine computer monitor air-fuel mixture and adjust fueling as conditions change. If you are replacing a worn sensor on a Nissan Altima rear or center location, or an INFINITI G20 rear sensor, this part number provides a direct replacement path.

This part cross-references Bosch 15949 and DENSO Auto Parts 234-4302 for the same application. The Delphi ES20218 also aligns with OE heritage and manufacturing knowledge built into Delphi aftermarket components.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Reduced fuel economy from incorrect air-fuel correction
• Failed emissions inspection tied to sensor degradation
• Slow sensor response after extended heat cycling

Installation Notes and Tips

Verify the sensor position before ordering, since this part is used in center and rear locations depending on the vehicle. Confirm thread size, connector shape, and wire routing against the original sensor before installation. For 2001 INFINITI G20, rear; 2001 Nissan Altima, rear; 2002-2004 Nissan Altima, center; and 2002 INFINITI G20, rear, match the application exactly to the vehicle build.

Use the vehicle application details to confirm the correct placement for your Nissan Altima or INFINITI G20. Proper installation helps ensure accurate exhaust readings and dependable engine management feedback.

Quality Assurance

Delphi draws on more than a century of OE experience and supplier knowledge from working with major automakers. That OE background is reflected in the design and manufacturing approach behind the ES20218 oxygen sensor.