[jimswhims]

Depends - i looked into it (with chatgpt's help) recently after getting quoted 270 euro for a spare fob for a second hand car I bought that only had one key.

It seems like a kind of niche field with a lot of pitfalls and poor availability of information but it seems like it's possible to do if you buy some budget key programmer, as long as you can figure out which encryption type the immobiliser uses. There should be an FCC id on the key fob somewhere, then it should be possible to figure out which type of encryption it uses, there's usually some codename like ID46 or something like that.

From that article it seems like it was easier to do for that car than it is for most new-ish cars.

These are 2 of the programmers i'm looking at getting, also expensive but worth IMO, if you can get the right one, make a couple of spares for yourself, family, friends etc, then sell it on or maybe even run a (less extortionate, hopefully) side hustle yourself.

https://www.xhorsevvdi.com/wholesale/vvdi-key-tester.html https://store.autel.com/products/autel-maxiim-km100