Cherokee 2.0L Oxygen Sensor 68090640AA 234-4579 improves fuel economy

The Lucoma (Freedom) 2.0L oxygen sensor 68090640AA (corresponding to 234-4579, 68090640AB and 68243213AA) is installed in the exhaust pipe, monitors exhaust oxygen content in real time and feeds back to the ECU to precisely control the air-fuel ratio, improving fuel economy and reducing emissions. Fits Liberty 2.0L models; installation difficulty medium; use a dedicated socket; after installation, clear fault codes with a diagnostic tool to ensure compatibility and stability.