The Bosch Oxygen Sensor 15644 is a direct fit replacement for the Kia Spectra model years 2001-2004 with a 1.8L L4 engine. This sensor is designed to accurately measure the oxygen content of the exhaust gas, ensuring optimal engine performance and emission control. With a manufacturer warranty of 1 month, this Bosch sensor offers reliability and peace of mind for Kia Spectra owners looking to maintain their vehicle's emission system.