Delphi ES10910 Oxygen Sensor - Rear

Rear Oxygen Sensor for Ford Focus

Delphi ES10910 is a heated rear oxygen sensor built for 2003-2007 Ford Focus applications. It uses OE-based engineering from a supplier with long-standing original equipment experience, helping maintain accurate exhaust feedback for the rear sensor position.

Key Features

• Heated oxygen sensor for rear placement
• 4-wire design with square connector shape
• 18 x 1.5 mm thread size
• 400.0 overall length
• Includes oxygen sensor and instruction sheet
• Fits 2003-2007 Ford Focus, rear

Detailed Description

Delphi ES10910 is an emission control oxygen sensor for the rear position on 2003-2007 Ford Focus models. The heated sensor design helps the unit reach operating temperature quickly, supporting stable exhaust monitoring after the catalytic converter. With a 4-wire layout, square connector, and 18 x 1.5 mm thread size, this Delphi ES10910 replacement is built for direct-fit service where the original rear sensor is specified. Delphi draws on OE heritage and supplier experience used by major automakers, and that background is reflected in the design and application coverage of this part. This part cross-references Bosch (e.g., 15645, 15802) for the same application.

Common Issues This Part May Address

• Check engine light related to rear oxygen sensor performance
• Fault codes tied to slow sensor response or heater circuit concerns
• Reduced exhaust monitoring accuracy after the catalytic converter
• Rough emissions test results caused by a failing rear sensor
• Incorrect air-fuel feedback data from a worn oxygen sensor

Installation Notes and Tips

Confirm the rear sensor location before installation and verify connector shape, wire count, and thread size against the original unit. Inspect the harness routing and exhaust threads for damage or corrosion before fitting the new sensor. Use the included instruction sheet during installation and clear diagnostic trouble codes after replacement if required by the vehicle.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and application knowledge developed through work with top automakers. The ES10910 is engineered to meet the demands of rear oxygen sensor service on the Ford Focus platform.