How to reprogram my car fob?

We loaned our van to a "friend," who brought it back without the fob attached to the keychain. She claims she doesn't know what happened to it, but it's unnerving to think that someone out there might have access to our van, whether it's her or someone else.

Is there a way to reprogram the whole system so that the old fob will no longer work on the van? I know that the remotes can be programmed.

It's a 2006 Honda Odyssey.

Yes it can be reprogramed but it will be pricey.

Yes. But you'll have to go to the dealer. And buy one keyfob. Give them the one you have too, and they'll erase the memory and program the two keys to the car. The old lost key won't work. I've done this several times for customers in this situation. Keep in mind if you have a physical key (not a smart access system) they could still unlock the doors. But won't be able to start the car.

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