Hyundai/Kia lambda/air-fuel ratio sensor 39210-25150 oxygen sensor replacement OEM quality

Hyundai air–fuel ratio sensor 39210-25150 directly substitutes the OEM oxygen sensor; broad compatibility with most Hyundai models. Core function is real-time monitoring of exhaust oxygen content and feeding back to the ECU to precisely adjust fuel injection, ensuring engine runs at optimal air–fuel ratio. Mainly fits Hyundai Elantra, Sonata, Santa Fe (specific year check original part number). After installation, it can resolve high fuel consumption, weak acceleration, or engine warning light. If idle is unstable, exhaust emits black smoke, or there is a pungent exhaust smell, sensor aging is likely; replace promptly.