Kia Forte Sportage Oxygen Sensor 39350-2A400 Universal Replacement 9350933002 Stable Air-Fuel Ratio

This oxygen sensor directly replaces OEM numbers 39350-2A400 and 9350933002, and is also compatible with 0281004087, 0281004091, 39350-2A420; basically a universal replacement. Its core function is to monitor oxygen content in exhaust in real time and send signals to the ECU to precisely adjust the air-fuel ratio, ensuring engine combustion efficiency. Fits Kia Forte and K5, as well as some Hyundai models; after installation it can address high fuel consumption, weak acceleration, and excessive exhaust emissions. If you notice rough idling, the engine light is on, or sudden fuel economy rise, most likely the oxygen sensor is aging and should be replaced.