Bosch 18077 Oxygen Sensor

Bosch Actual OE Oxygen Sensor for Hyundai and Kia

Bosch 18077 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for select Hyundai Genesis, Hyundai Equus, Kia Borrego, and Kia K900 applications, including upstream and downstream positions.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Narrow-band heated design for stable closed-loop fuel control
• Specific fit with square 4-pin connector and 4-wire harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Wiring harness included; harness length measures 12.6 in
• Overall length: 15.9 in; sealing surface to connector end: 14.8 in

Detailed Description

Bosch 18077 uses a switching-type narrow-band sensing element to report exhaust oxygen content to the engine control unit, helping maintain accurate air-fuel management during warm-up, cruise, and load changes. Bosch’s OE development history includes early thimble-style sensors and later planar narrowband designs, and this sensor reflects that experience with faster light-off behavior, improved lambda accuracy, and quicker closed-loop operation. It is a direct-fit oxygen sensor for Hyundai Genesis, Hyundai Equus, Kia Borrego, and Kia K900 vehicles where the original sensor location is upstream right, upstream left, downstream right, downstream left, or downstream, depending on application.

This part cross-references Hyundai/Kia OE numbers 392103F000 and 392103F010 for the same application. Bosch 18077 is a practical replacement choice when you need OE-style signal response and connector fitment on select Hyundai Genesis and Hyundai Equus exhaust systems.

What It Helps Address

• Check engine light related to oxygen sensor signal faults
• Rich or lean fuel trim conditions caused by inaccurate exhaust feedback
• Slow closed-loop transition after startup
• Reduced emissions performance from a worn narrow-band sensor
• Driveability issues tied to unstable air-fuel ratio control

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for multiple upstream and downstream locations. Use the 18 mm thread size and 22 mm hex specification to confirm tool access, and inspect the square male connector and 4-wire harness routing before installation. Because this is a threaded oxygen sensor, clean the bung threads as needed and route the harness away from heat and moving components.

Quality Assurance

Bosch supplies OE-proven oxygen sensor technology to the aftermarket, drawing on more than five decades of development in exhaust sensing and engine management. Bosch 18077 is built with ceramic sensing elements, optimized heater control, and heat-resistant materials for consistent operation under thermal and vibration load.