keyless entry remote question

Curious... If you get a used car that has keyless entry and it is missing the remote (key fob).. You buy a replacement remote and program it... If someone else has the original ..would it still unlock the vehicle if a replacement has been newly programmed?

Been reading that most, if not all, remotes have to be programmed at the same time.. So if you program a new/replacement remote...the original shouldn't work? (unless programmed at same time) Is this correct?

Reply to
M78Ultra
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, the old remote should not work with the system reprogrammed. Of course, someone will reply who knows someone who knew someone who had a friend and it did work. C R

Reply to
C R

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