Bosch 15320 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Hyundai and Kia

Bosch Validated Oxygen Sensor 15320 is a narrow-band heated downstream O2 sensor built for specific Hyundai and Kia applications. It provides the ECU with accurate air-fuel-ratio feedback to support stable combustion control and lower emissions in normal driving conditions.

For drivers searching for a downstream oxygen sensor for 2006-2009 Hyundai Sonata or 2007-2009 Kia Magentis, this Bosch Validated Oxygen Sensor 15320 offers OE-style fitment with a threaded metal housing, integrated wiring harness, and 4-wire blade-terminal design.

Key Features

• Specific-fit downstream oxygen sensor for listed Hyundai Sonata and Kia applications
• Narrow-band heated sensor design for closed-loop fuel control
• 4-wire configuration with blade terminals and rectangle connector
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Integrated wiring harness with 16.1 in harness length
• Metal housing with high-temperature-resistant construction
• Bosch Validated Oxygen Sensor line backed by Bosch OE development experience

Product Details

Bosch Part Number 15320 is engineered as a standard replacement downstream oxygen sensor for vehicles that rely on narrow-band signal feedback. Bosch developed its oxygen sensor technology from early thimble-style designs to planar narrowband sensors that respond quickly and help the ECU enter closed-loop operation sooner. That matters on vehicles such as the Hyundai Sonata, Kia Optima, Kia Rondo, and Kia Magentis, where accurate downstream sensor input supports emissions monitoring and consistent engine management.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough combustion control caused by aging sensor elements

Installation Notes and Tips

• Compatible With 2006-2009 Hyundai Sonata, downstream
• Compatible With 2007-2009 Kia Magentis, downstream
• Compatible With 2007-2008 Kia Optima, downstream
• Compatible With 2007-2008 Kia Rondo, downstream
• Compatible With 2006 Kia Optima, downstream, late production
• Verify connector shape, thread size, and harness routing before installation
• Use the threaded mounting point and proper oxygen sensor socket for removal and installation
• Inspect the exhaust bung and wiring path for heat damage or corrosion before replacing the sensor

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to deliver OE-proven performance for the listed Hyundai and Kia applications. Bosch Part Number 15320 is designed for durable operation under heat and vibration in everyday exhaust conditions.