现代起亚上游前氧传感器 39210-04000 AIUSLN

This upstream AIUSLN pre-cat upstream oxygen sensor (OEM 39210-04000 / 39210-2B100) precisely fits a range of Hyundai and Kia models, including Hyundai Sonata (2006–2010, 2.0L/2.4L), Kia Optima (2006–2010, 2.4L), and Kia Sorrento (2007–2010, 2.0L). Core function is real-time monitoring of exhaust oxygen content and feedback to the ECU to optimize air-fuel ratio, ensuring fuel economy and emission compliance. OEM numbers 39210-04000, 39210-2B100, and cross-reference 3921004000, 392102B100 for inventory matching. Replacement difficulty medium; use dedicated oxygen-sensor socket; protect wiring from damage; clear fault codes after installation. High OEM-grade quality for batch purchasing.