Bosch 18055 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for Hyundai and Kia

Bosch Validated Oxygen Sensor 18055 is a specific-fit, heated wideband air-fuel ratio sensor for select Hyundai Tucson and Kia Sportage applications. It delivers continuous, high-precision lambda measurement so the engine control unit can manage fueling with greater detail than a traditional switching sensor.

• Wideband A/F oxygen sensor for precise air-fuel ratio monitoring
• Heated design for faster sensor activity and stable operation
• Specific fit with 5-wire harness and 6-terminal configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 28.2 in overall length with included wiring harness
• Metal housing built for high-temperature exhaust environments

Product Line Details

Bosch Validated Oxygen Sensor products are built around Bosch’s wideband sensor technology, which uses a planar pump-cell design to measure the air-fuel mixture across the full lambda range. Bosch developed this sensor architecture for modern engine management systems that require accurate feedback during load changes, cold starts, and steady cruising. Part number 18055 follows that OE-focused approach for direct replacement use.

Fitment

• Fits 2010-2013 Hyundai Tucson, Upstream, without California Emission System
• Fits 2011-2013 Kia Sportage, Upstream, without California Emission System

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor or air-fuel ratio sensor faults
• Rough idle caused by inaccurate exhaust feedback
• Poor fuel economy from incorrect mixture control
• Delayed sensor response during warm-up or load changes
• Emissions test failure tied to upstream sensor performance

Installation Notes and Tips

Confirm upstream placement and verify the vehicle is without California Emission System before ordering Bosch 18055. Match the 18 mm thread size, 6-terminal connector, rectangle male connector, and 28.2 in harness length to the original sensor before installation. This part cross-references Hyundai/Kia OE number 392102G380 for the same application.

Quality Assurance

Bosch has more than five decades of OE development in oxygen sensor technology, and this validated replacement follows the same engineering focus used in modern engine management systems. Bosch 18055 is built for accurate signal control, fast light-off, and durable operation in demanding exhaust conditions.