last portion of the game, i found all the parts to fix the car (wrench,tire,fuel).
in a random house, there is a key simply called "the key"... is this the key to the car?
if it is, then the game must be bugged, i couldn't finish it. :(
Thanks for the reply and for reaching almost the end of the game.
You need the key to open the shed and inside is the car key which you need to start the car !