Bosch 18079 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Bosch Validated Oxygen Sensor for Downstream Control

Bosch Validated Oxygen Sensor 18079 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in downstream applications across select Chevrolet, Pontiac, and Saturn vehicles.

The Bosch Validated Oxygen Sensor line reflects Bosch’s OE development background, with switching-type sensor technology, ceramic sensing elements, optimized heater control, and high-temperature-resistant materials for consistent operation under thermal and vibration load. Part number 18079 is a threaded, 4-wire replacement sensor with a square female connector and included wiring harness.

Key Features

• Specific-fit Bosch oxygen sensor for downstream applications
• Narrow-band heated sensor design for closed-loop fuel control
• 4-wire configuration with square female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for direct replacement use
• Standard replacement grade for emission control service
• Fits downstream left, downstream, and downstream right positions depending on vehicle application

Detailed Product Overview

Bosch 18079 is engineered as a switching-type oxygen sensor that reports exhaust oxygen content to the engine control unit so the fuel system can maintain the proper air-fuel ratio. This helps support smoother closed-loop operation and emissions performance in vehicles that use a narrow-band heated sensor in the downstream location. Compatible applications include 2008-2012 Chevrolet Malibu, 2008-2011 Chevrolet Impala, 2008-2010 Pontiac G6, and 2008-2010 Saturn Vue, along with additional listed Chevrolet, Pontiac, and Saturn models. This part cross-references GM OE numbers 12608662 and 12608693 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Slow or inaccurate downstream O2 sensor response
• Emissions test failures tied to sensor signal issues
• Fuel control problems caused by incorrect exhaust feedback
• Harsh operating conditions affecting sensor stability

Installation Notes and Tips

Verify the vehicle’s exact year, make, model, and sensor position before ordering. This Bosch Validated Oxygen Sensor 18079 uses a threaded mount, 4-wire layout, and square female connector, so connector shape and harness routing should be matched to the original part. For best results, inspect the exhaust bung threads and wiring condition before installation on Chevrolet Malibu, Chevrolet Impala, Pontiac G6, or Saturn Vue applications.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to OE-proven standards for accuracy and durability in aftermarket service.