For most immobilizers like this you'll need to find the programming code for these. Should be on a card with a 4-5 digit code one it. Without it, you're pretty much out of luck for programming a new one or even turning it off in the case that you lose your last one.
Would suggest replacing the system if you don't have the card. Last thing you want is to be stuck somewhere far, then have to tow it, wait until morning, etc.
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