Is it ever possible to leave all the windows fully down without having an active key in the car?

[holmgang]

Sometimes I want to vent the car fully, without seating in it or leaving a phone/card key inside the vehicle. The vent feature is not enough.

 

[GtiMart]

Why not? Roll the windows down, close the doors and walk away. If you have the option to close windows when the car locks, just turn that option off. Or disable walk-away lock if you don't want the car to lock.
You can't do that remotely though as far as I know.

 

[holmgang]

yes, there is. i had totally forgoten about it