Bosch 13747 Oxygen Sensor - Downstream Right

Bosch Validated Oxygen Sensor for OE Fitment

Bosch Part Number 13747 is a narrow-band heated oxygen sensor built for specific downstream right applications. It delivers air-fuel-ratio feedback to the ECU for stable combustion control and lower emissions, with OE-style construction for dependable operation in demanding exhaust conditions.

Key Features

• Bosch Validated Oxygen Sensor line with OE-proven development
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Specific fit design with threaded mounting
• 4-wire configuration with square connector and male terminals
• Metal housing with high-temperature-resistant construction
• 23.3 in wiring harness length and included wiring harness
• 22 mm hex size and 18 mm thread diameter

Product Details

Bosch developed its oxygen sensor technology from early thimble-style designs to planar narrowband sensors that respond quickly and support accurate lambda measurement. Bosch Part Number 13747 uses that OE engineering background in a standard replacement sensor for vehicles that need precise downstream oxygen feedback. It is a threaded, heated narrow-band sensor with a 4-wire layout, blade terminals, and a square male connector for direct replacement service.

Compatible with 2001-2002 Hyundai Santa Fe, downstream right; 1999-2002 Hyundai Sonata, downstream right; 2003 Hyundai Tiburon, downstream right; 2001-2002 Kia Optima, downstream right; 2002 Kia Magentis, downstream right; and 2003 Kia Magentis, downstream right. Bosch 13747 also matches the listed downstream right applications for these Hyundai and Kia models, including the 2003 Hyundai Tiburon and 1999-2002 Hyundai Sonata.

This part cross-references Hyundai/Kia OE numbers 3921037140 and 3921037145 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough idle or unstable closed-loop fuel control
• Higher exhaust emissions from a worn downstream sensor
• Slow sensor response after exhaust heat cycling

Installation Notes and Tips

Install Bosch 13747 in the downstream right exhaust location specified by the vehicle application. Verify the 18 mm thread size, 22 mm hex, connector shape, and 4-wire harness routing before installation. Because this is a heated narrow-band sensor, proper connector engagement and secure harness placement are important for reliable signal transfer and heat resistance.

Quality Assurance

Bosch backs this oxygen sensor line with more than five decades of OE development and aftermarket supply experience. The Bosch Validated Oxygen Sensor range is built to OE-proven standards for accurate measurement, durable materials, and consistent performance under thermal and vibration load.