Bosch 13746 Oxygen Sensor - Upstream Front or Upstream Right

Bosch Validated Oxygen Sensor for Hyundai and Kia

Bosch Part Number 13746 is a specific-fit, narrow-band heated oxygen sensor for select Hyundai and Kia applications. It provides direct air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate combustion management, and lower emissions.

The Bosch Validated Oxygen Sensor line builds on Bosch OE development, including early thimble-style sensors and later planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop response. Bosch 13746 uses durable ceramic and high-temperature materials for consistent operation in demanding exhaust conditions.

Key Features

• Specific-fit oxygen sensor for select upstream right and upstream front locations
• Narrow-band heated sensor for faster warm-up and closed-loop operation
• 4-wire design with square connector and blade terminals
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Wiring harness included for direct replacement service
• Standard replacement grade for OE-style service work
• Metal housing built for high-temperature and vibration exposure

Detailed Description

Bosch 13746 is an OE-style switching oxygen sensor engineered for precise feedback in the exhaust stream. It is used on select 1999-2005 Hyundai Sonata, Santa Fe, and Tiburon applications, as well as 2001-2003 Kia Optima, Magentis, and 2002 Kia Magentis upstream positions. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

As part of the Bosch Validated Oxygen Sensor line, this sensor reflects Bosch’s long history in oxygen-sensor development and aftermarket OE replacement. The narrow-band heated design supports accurate mixture control once the sensor reaches operating temperature, helping the engine computer maintain proper fuel delivery under changing load and temperature conditions. Part number 13746 is a practical choice when replacing a worn upstream oxygen sensor on Hyundai Sonata, Hyundai Santa Fe, or Kia Optima platforms.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Slow sensor response during closed-loop operation
• Rich or lean fuel mixture control issues
• Reduced emissions performance from a degraded upstream sensor
• Driveability concerns tied to inaccurate exhaust oxygen feedback

Installation Notes and Tips

Install Bosch 13746 only in the listed upstream right or upstream front positions for the confirmed vehicle applications. Verify connector shape, wire count, thread size, and sensor location before installation. Because this is a threaded exhaust sensor, use proper removal tools and follow service procedures for the vehicle’s exhaust system to avoid thread damage or connector strain.

For fitment, use the exact vehicle listing: Fits 2001-2005 Hyundai Santa Fe, Upstream Right; Fits 2003 Hyundai Tiburon, Upstream Right; Fits 1999-2002 Hyundai Sonata, Upstream Right; Fits 2001-2003 Kia Optima, Upstream Right; Fits 2001-2002 Kia Magentis, Upstream Right; Fits 2002 Kia Magentis, Upstream Front; Fits 2003 Kia Optima, Upstream Right.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accuracy, durability, and consistent performance in aftermarket service.