Delphi ES11071 Oxygen Sensor - Rear

Delphi ES11071 Oxygen Sensor Overview

The Delphi ES11071 is a heated rear oxygen sensor built for precise exhaust monitoring in select Hyundai and Kia applications. It draws on Delphi’s OE heritage and decades of supplier experience to support accurate air-fuel feedback in the emissions system.

Compatible with 2006-2009 Hyundai Sonata, rear; 2006-2008 Kia Optima, rear; and 2007-2008 Kia Rondo, rear. This Delphi oxygen sensor ES11071 is a direct-fit replacement for vehicles that require an 18 x 1.5 mm threaded, 4-wire sensor with a square connector.

Key Features

• Heated oxygen sensor for rear exhaust placement
• 4-wire design for signal and heater circuit operation
• Square connector shape for OE-style connection
• 18 x 1.5 mm thread size for proper exhaust bung fitment
• Includes oxygen sensor and instruction sheet
• Built with Delphi OE experience and aftermarket application knowledge

Detailed Description

Delphi ES11071 is engineered for rear sensor locations on 2006-2009 Hyundai Sonata, 2006-2008 Kia Optima, and 2007-2008 Kia Rondo models. As a heated oxygen sensor, it helps monitor exhaust oxygen content after the catalytic converter, supporting the vehicle’s emissions control strategy and engine management system. The 4-wire configuration, square connector, and 18 x 1.5 mm thread size make it a practical OE-style replacement when the original sensor has failed or is no longer responding correctly. This part cross-references Bosch 15320 for the same application.

Common Issues This Sensor May Address

• Check engine light related to rear oxygen sensor faults
• Incorrect oxygen sensor voltage or slow sensor response
• Emissions test failure caused by a failed rear sensor
• Fuel trim or catalyst efficiency diagnostic trouble codes
• Rough emissions-system feedback after sensor aging or contamination

Installation Notes and Tips

Verify rear sensor placement before ordering and confirm the connector shape, wire count, and thread size match the original part. Inspect the exhaust bung threads and wiring routing before installation, and follow the included instruction sheet for proper replacement steps. For best results, clear diagnostic trouble codes after installation and confirm the repair with a scan tool.

Quality Assurance

Delphi builds this oxygen sensor using OE-focused engineering informed by its long history supplying major automakers. The ES11071 is intended as a direct replacement for the listed Hyundai and Kia rear sensor applications and is backed by Delphi’s manufacturing standards for emissions control components.