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is there an implant for the key less entry system to my car? It's a subaru.
I'm quite certain there is not. It appears those keys are active transmitters and run on batteries so changing them would be a pain (pun intended). You'd also have to pre-programm those keys for your car (which involves inserting and turning the key in the ignition on many car models).
Theoretically you could hack apart a ready to use key fob and coat it in something bioinert but that's about as good as you'll get without re-engineering quite a bit.