Door handle outside without function, Ford Ka passenger side

Hello My friend’s 98’s Ka is the door handle outside on the passenger side without any function! But the Ka can still be opened and locked by ZV at this door with the key, only then you have to open the door from the inside on the handle. I think there is only something unmounted or something like that? First wanted to ask before I remove the door panel. For this I have already found a guide here. Oh yes, by the way, the driver door can rarely be locked with the key. You have to lock up from the passenger side anyway. The next time you go again. Maybe someone can help me there. Thank you Markus & Anna