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by zulln 1937 days ago
A lot of them actually have a real key "hidden" within the digital fob, see example: https://www.bimmer-tech.net/blog/item/105-about-bmw-key-fob

I have never had to actually use it, but looked into it when I got low battery-warnings to make sure I would not be locked out.

Assuming this is not a legal requirement I am sure there are models where this is not possible though.
1 comments
kyriakos 1937 days ago
those are for opening the doors but you cannot use them to start the engine
link
zulln 1936 days ago
From the link: > Once inside your vehicle, insert your remote key fob in the ignition slot or, if your car doesn't have one, hold it against the key markings on the side of the steering column. You'll then be able to start your BMW with the start/stop button on your vehicle's dashboard, even if your key fob is dead.

Other cars probably have other solution. It was possible in my case as well (not BMW) but do not remember the process.

link