Passenger Door Handle

[Lex Luthor]

If you look at the external handle when it's pulled open, you can see the end of the cable - is ther a way of retensioning the cable from the outside of the car?

Just above the door lock, covered by the door seal, is a torx-T20 setscrew that secures the blanking cover at the rear of the handle.
Slacken it off, remove the cover, and you can adjust the cable by repositioing the cable end.