Comment by brookst

As someone who bought a used car with a weird head unit integration to set car features, behind a pin, and who was never able to get the pin (previous owner forgot, wasn’t written down, no clear path to reset)… I think it’s not a great solution.

Some cars have special valet keys, which prevent aggressive driving and high speeds, and maybe that’s the solution? But of course it means remembering to bring the special key.

Maybe the answer is just to look at loaning your car the same as handing your unlocked laptop to someone.