@sinan1 by know you probably already know that P0441 is indicative of the Evaporative control system purge flow being incorrect. Yes, can be something as simple as a bad Fuel Cap. P2420 is a code for Evaporative Emission System Switching Valve Control Circuit High which is commonly caused by a stuck or failed vent valve, which would also could cause both codes to show up together. For the location of the valve check sites [https://www.yarisworld.com/forums/showthread.php?t=26265|like this]. For a proper diagnosis you will need at least a vacuum pump and a multi meter and use the Emission control part [document|26321] from the service manual as your guide.