Delphi ES10399 Oxygen Sensor - Front

Delphi ES10399 Oxygen Sensor Overview

The Delphi ES10399 is a heated oxygen sensor built for front-position exhaust monitoring on select Saab and Porsche applications. It combines OE heritage with application-specific fitment details, including a 4-wire design, flat connector shape, and 18 x 1.5 mm thread size.

Compatible with 1999 Saab 9-3 front, 1996-1998 Saab 900 front, 1996-1998 Saab 9000 front, and 1994 Porsche 911, this Delphi oxygen sensor supports accurate air-fuel feedback for the engine management system.

Key Features

• Heated oxygen sensor for faster operating temperature
• 4-wire configuration for the listed applications
• Flat connector shape for direct-fit replacement use
• 18 x 1.5 mm thread size
• Overall length: 1130.0
• Front position fitment
• Package contents include the oxygen sensor and instruction sheet

Detailed Description

Delphi ES10399 is engineered as a front oxygen sensor replacement for vehicles that rely on precise exhaust-gas feedback to manage fuel delivery and emissions performance. Delphi draws on more than a century of OE experience, and that background is reflected in the sensor design and application coverage. This part cross-references Bosch 13662 and DENSO Auto Parts 234-4185 for the same application.

Use Delphi ES10399 when servicing a 1999 Saab 9-3 front, a 1996-1998 Saab 900 front, a 1996-1998 Saab 9000 front, or a 1994 Porsche 911 with the New Body Style configuration. The part number ES10399 is also useful when searching for a direct replacement oxygen sensor for these front-mounted applications.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect fuel trim readings from a worn front sensor
• Reduced exhaust feedback accuracy to the engine control system
• Emissions test failures tied to sensor response issues
• Rough idle or drivability concerns caused by aging sensor output

Installation Notes and Tips

Confirm the front sensor location, connector shape, wire count, and thread size before installation. Match the vehicle application carefully, especially on the 1999 Saab 9-3 where chassis notes apply, and on the 1994 Porsche 911 New Body Style listing. Inspect the harness routing and connector condition before connecting the new sensor.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and knowledge developed through supplier relationships with major automakers. The ES10399 is supplied with an instruction sheet to support correct installation and service.