Bosch 15655 Oxygen Sensor

Bosch Oxygen Sensor for Hyundai and Kia

Bosch 15655 is a narrow-band heated oxygen sensor built for specific Hyundai and Kia applications. It delivers air-fuel-ratio feedback to the ECU for stable combustion control and emissions management across changing operating conditions.

The Bosch Engineered Oxygen Sensor line draws on Bosch OE development dating back to the original oxygen sensor design introduced in 1976. This Bosch 15655 uses a threaded, heated, narrow-band configuration with a square 4-pin connector and included wiring harness for direct replacement service on select Hyundai Tucson, Hyundai Santa Fe, Hyundai Sonata, Hyundai Tiburon, Kia Sportage, Kia Magentis, and Kia Optima applications.

Key Features

• Part number: 15655
• Brand line: Bosch Engineered Oxygen Sensor
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific-fit replacement with threaded mounting
• 4-wire design with blade terminals and square male connector
• Wiring harness included
• 18 mm thread diameter and 22 mm hex size
• Metal housing for high-temperature service

Detailed Product Overview

Bosch 15655 is engineered for precise oxygen sensing in the exhaust stream so the ECU can adjust fuel delivery based on real-time exhaust content. Bosch uses advanced ceramic sensing elements, optimized heater control, and heat-resistant materials to maintain consistent signal quality under thermal cycling and vibration. As a standard replacement oxygen sensor, it is built for direct service on confirmed Hyundai and Kia fitments, including 2005-2009 Hyundai Tucson, 2003-2006 Hyundai Santa Fe, and 2004-2006 Kia Optima applications. This part number 15655 is also listed for 2005-2010 Kia Sportage and 2003-2005 Hyundai Sonata positions shown in the fitment data.

This part cross-references Hyundai/Kia OE numbers 3921037190 and 3921037513 for the same application.

What It Helps Address

• Rich or lean fuel trim conditions caused by inaccurate exhaust oxygen readings
• Check engine light concerns related to oxygen sensor performance
• Slow closed-loop response during warm-up or driving transitions
• Emissions test failures tied to sensor degradation
• Rough combustion control from a worn upstream or downstream sensor

Installation Notes and Tips

Verify the sensor position before ordering, since fitment varies by year, make, model, and location. Confirm the threaded mounting style, 18 mm thread size, 22 mm hex, 4-wire connector, and harness length against the original sensor before installation. For best results, inspect the exhaust bung threads and connector condition, and route the harness away from heat sources and moving components.

Compatible With 2005-2010 Kia Sportage, upstream right; 2005-2010 Kia Sportage, upstream left; 2005-2010 Kia Sportage, downstream left; 2005-2009 Hyundai Tucson, upstream right; 2005-2009 Hyundai Tucson, downstream left; 2005-2009 Hyundai Tucson, upstream left; 2006-2008 Hyundai Tiburon, downstream left; 2003-2006 Hyundai Santa Fe, downstream left; 2006 Hyundai Santa Fe, upstream left; 2004-2006 Kia Magentis, downstream left; 2004-2006 Kia Optima, downstream left; 2005 Hyundai Santa Fe, upstream left; 2003-2005 Hyundai Sonata, downstream left; 2004-2005 Hyundai Tiburon, downstream right; 2003 Hyundai Tiburon, downstream left; 2003 Hyundai Tiburon, downstream right; 2003 Kia Magentis, downstream left; 2003 Kia Optima, downstream left.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this product line. The Bosch Engineered Oxygen Sensor range is built to OE-proven standards for signal accuracy, heater performance, and durability in demanding exhaust environments.