Bosch 13748 Oxygen Sensor - Upstream Left or Upstream Rear

Bosch Validated Oxygen Sensor 13748

Bosch Validated Oxygen Sensor 13748 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 across changing engine loads, making it a direct replacement choice for select Hyundai and Kia applications.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Narrow-band heated design for faster closed-loop operation
• Blade terminals, square connector, and 4-wire harness configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included with 10.4 in harness length
• Overall length: 13.4 in; sealing surface to connector end: 12.2 in

Product Details

Bosch 13748 uses a switching-type oxygen sensor design to report exhaust oxygen content to the engine control unit. Bosch developed this sensor line from its long-running OE oxygen sensor engineering, including planar narrowband technology that improves light-off response and closed-loop accuracy. For drivers servicing a Hyundai Tiburon, Hyundai Sonata, Hyundai Santa Fe, Kia Optima, or Kia Magentis, this Bosch Validated Oxygen Sensor is built to match the original application requirements with the correct connector style, heater configuration, and threaded mount.

This part cross-references 392103716A for the same application.

What It Helps Address

• Check engine light caused by oxygen sensor signal faults
• Rich or lean air-fuel mixture readings at the ECU
• Delayed closed-loop fuel control after startup
• Emissions test failures related to sensor performance
• Rough combustion control from an aging upstream sensor

Installation Notes

Verify the connector shape, wire count, thread size, and sensor position before installation. This Bosch 13748 is listed for upstream left and upstream rear locations on specific Hyundai and Kia models, including 2003 Hyundai Tiburon, 1999-2002 Hyundai Sonata, 2001-2002 Hyundai Santa Fe, 2001-2002 Kia Optima, and 2001-2002 Kia Magentis. Confirm the vehicle build date where noted, such as 2003 Hyundai Tiburon and 2003 Kia Optima applications limited to vehicles built to 12/2002.

• Fits 2003 Hyundai Tiburon, upstream left, to 12/2002
• Fits 2003 Kia Optima, upstream left, to 12/2002
• Fits 2001-2002 Hyundai Santa Fe, upstream left
• Fits 1999-2002 Hyundai Sonata, upstream left
• Fits 2002 Kia Magentis, upstream rear
• Fits 2001-2002 Kia Optima, upstream left
• Fits 2001 Kia Magentis, upstream left

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience and a validated aftermarket design approach. The sensor uses durable ceramic elements, optimized heater control, and heat-resistant materials to maintain consistent operation under thermal and vibration stress.