I understand that the ability to unlock or lock a car is based on the frequency of the transmission from the key, but hypothetically wouldn’t some of these eventually overlap and lead to someone being able to unlock someone else’s car?
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This does sometimes happen. As the other commenter says, newer cars and remotes have some technology that makes this less likely. But it’s still possible in very rare cases, and more common in older cars.
The “protection” against it is – what is the chance that the other car that matches your remote’s frequency/code happens to be nearby? In practice, even with older cars that did not have as sophisticated security, it wasn’t very common for somebody to run into a car that could be opened with the same remote. At a dealership with a bunch of cars of the same model, maybe. In a random parking lot, unlikely
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