Delphi ES10943 Oxygen Sensor - Front

Delphi ES10943 Front Oxygen Sensor

Restore accurate exhaust feedback with the Delphi ES10943 front oxygen sensor. Built from Delphi’s OE experience and heritage, this sensor is made for direct replacement service on select Subaru and Saab applications, including Subaru Legacy, Outback, Forester, and Impreza front sensor locations.

• Front oxygen sensor for emission control service
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size for proper exhaust manifold fitment
• Overall length: 575.0
• Package contents: oxygen sensor and instruction sheet
• Direct-fit replacement for select Subaru Legacy, Outback, Forester, Impreza, and Saab 9-2X front applications

OE-Style Construction and Fitment

The Delphi ES10943 is engineered for front sensor positions on 2004 Subaru Legacy and Outback, 2004-2005 Subaru Forester, 2005 Subaru Impreza, 2005 Subaru Legacy and Outback without California Emission System, 2005-2006 Saab 9-2X with Air-Fuel Ratio Sensor application, and 2006-2009 Subaru Legacy and Outback. Delphi’s OE background helps ensure the sensor reflects the fit, form, and function expected in emission control repair work. This part cross-references Bosch 15171 and DENSO Auto Parts 234-9122 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the front sensor location
• Rough idle or drivability issues tied to exhaust feedback
• Failed emissions inspection caused by a worn front sensor
• Slow sensor response or degraded fuel control feedback

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and front position before installation. Inspect the exhaust bung threads and wiring routing before tightening the sensor to specification. Confirm vehicle emission configuration on 2005 Subaru Legacy and Outback models, since this part is listed for vehicles without California Emission System. Use the included instruction sheet during installation and clear diagnostic trouble codes after replacement.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and supplier knowledge developed through work with major automakers. The ES10943 is intended as a direct replacement part for the listed front applications and is backed by Delphi’s aftermarket engineering standards.