Bosch 16149 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 16149

Bosch 16149 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for the upstream position on select Hyundai and Kia applications, including Hyundai Elantra, Kia Soul, and Hyundai Tiburon.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated O2 sensor for upstream use
• Specific-fit design with 4-wire harness and 4 terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Rectangle male connector with included wiring harness
• Steel finish, metal housing, and high-temperature-resistant construction
• Wiring harness length: 19.9 in; overall length: 23.2 in

Product Details

Bosch Actual OE Oxygen Sensor 16149 uses a switching-type narrow-band design to measure exhaust oxygen content and send accurate feedback to the engine control unit. Bosch developed this sensor line from its OE oxygen sensor experience, including planar narrowband technology that improves light-off response, lambda accuracy, and closed-loop operation. For drivers searching for an upstream oxygen sensor for 2009-2012 Hyundai Elantra, 2010-2011 Kia Soul, or 2007-2008 Hyundai Tiburon, this Bosch 16149 replacement matches the specific-fit application and connector layout required by those vehicles. This part cross-references 3921023800 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture feedback to the ECU
• Rough combustion control during closed-loop operation
• Emissions test failures caused by a worn upstream sensor
• Slow sensor response from an aging narrow-band O2 sensor

Installation Notes

Install in the threaded upstream location specified for the vehicle application. Confirm the connector shape, wire count, and harness routing before installation. The sensor uses an 18 mm thread size and 22 mm hex, so the correct oxygen sensor socket or wrench is recommended. Verify the harness is secured away from heat and moving components after installation.

Quality Assurance

Bosch backs this oxygen sensor line with more than five decades of OE development and supplies aftermarket parts built to OE-proven standards. The sensor uses ceramic elements, controlled heater operation, and heat-resistant materials for consistent performance under thermal and vibration load.