Delphi ES20151 Oxygen Sensor - Front, Front Left or Front Right

Delphi ES20151 Oxygen Sensor Overview

The Delphi ES20151 is a heated oxygen sensor built for precise exhaust monitoring in select Ford, Mazda, Lincoln, and Mercury applications. It draws on Delphi’s OE heritage and decades of supplier experience to deliver the fit and signal characteristics expected in front oxygen sensor service.

Compatible With front, front left, and front right positions depending on vehicle application, this sensor is a direct replacement choice for 1999-2012 Ford Ranger, 1999-2001 Ford Explorer, and related models listed below.

Key Features

• Heated oxygen sensor design for faster operating temperature
• 4-wire configuration for the specified vehicle applications
• Round connector shape for OE-style connection fitment
• 18 x 1.5 mm thread size
• 390.0 overall length
• Package includes the oxygen sensor and instruction sheet
• Position-specific coverage for front, front left, and front right locations

Detailed Description

Delphi ES20151 is engineered for vehicles that rely on a front-mounted oxygen sensor to monitor exhaust oxygen content and support engine management. It is listed for 1999-2001 Ford Explorer, 2001-2011 Ford Ranger, 2004-2009 Mazda B4000, 2007-2008 Ford Expedition, 2007-2008 Lincoln Navigator, 2001-2005 Ford Explorer Sport Trac, 2001-2002 Ford Explorer Sport, and 1999-2001 Mercury Mountaineer, with position-specific coverage shown in the fitment data. This part number, ES20151, is also referenced across multiple aftermarket catalogs for the same application.

This part cross-references Bosch 13117 for the same application.

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn front sensor
• Slow sensor response during closed-loop fuel control
• Emissions test failures tied to front oxygen sensor faults
• Rough idle or drivability concerns caused by inaccurate exhaust feedback

Installation Notes and Tips

• Verify the exact position before ordering: front, front left, or front right.
• Confirm thread size and connector style match the original sensor.
• Use the vehicle application details for 2006 Ford Ranger, since fitment is listed only through 05/01/2006 for front left and front right positions.
• Inspect the harness routing and connector condition before installation.
• Follow the included instruction sheet and the vehicle service procedure for proper sensor replacement.

Quality Assurance

Delphi builds this oxygen sensor with OE experience and supplier knowledge developed over 100 years of serving major automakers. That background is reflected in the application-specific design and the attention to fitment details used for front oxygen sensor replacement on Ford Ranger, Ford Explorer, Mazda B4000, and related vehicles.