Delphi ES20219 Oxygen Sensor - Center or Rear

Delphi ES20219 Oxygen Sensor Overview

The Delphi ES20219 is a heated oxygen sensor built for rear and center exhaust positions on select Subaru and Saab applications. It draws on Delphi’s OE heritage and decades of original-equipment experience to deliver the sensor specifications needed for accurate exhaust monitoring.

Compatible with Subaru WRX STI rear, Subaru Impreza rear, Subaru Legacy rear, Subaru Outback rear, Subaru Forester rear, Subaru Baja rear, and Saab 9-2X rear applications, this oxygen sensor is a direct-fit replacement for vehicles that use the listed connector and thread configuration.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire design
• Square connector shape
• 18 x 1.5 mm thread size
• 700.0 overall length
• Package includes oxygen sensor and instruction sheet
• Position-specific coverage for center and rear locations; verify the Application tab for your vehicle

Detailed Description

Delphi ES20219 is engineered as an OE-style emission control sensor for vehicles that require a heated rear or center oxygen sensor. It is used in exhaust systems to monitor oxygen content and support proper engine management, helping the vehicle’s control system maintain accurate air-fuel feedback. This part cross-references Bosch 15009 and DENSO Auto Parts 234-4445 for the same application.

For Subaru Impreza rear oxygen sensor replacement, Subaru Outback rear oxygen sensor replacement, or Subaru WRX STI rear oxygen sensor service, the ES20219 provides the connector, thread, and wire configuration needed for a proper match. It also applies to select Saab 9-2X rear positions.

Common Issues This Part May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a worn rear or center sensor
• Slow sensor response after extended exhaust heat exposure
• Emissions test failures tied to sensor signal faults
• Rough idle or drivability concerns caused by inaccurate exhaust readings

Installation Notes and Tips

Confirm the exact position before ordering, since this part is listed for center and rear locations depending on application. Verify the 4-wire square connector, 18 x 1.5 mm thread size, and overall length against the original sensor on your Subaru Legacy, Subaru Forester, Subaru Baja, or other listed vehicle. Follow the included instruction sheet and inspect the exhaust bung threads before installation.

Quality Assurance

Delphi builds aftermarket parts using OE experience and knowledge developed through long-term supply relationships with major automakers. That OE heritage is reflected in the ES20219’s fitment-focused design and sensor specifications.