Air Tag beeps in car when someone else is driving it.

AirTags are intended for lost stuff, not for stolen stuff.

Adding a tracker to others can also happens with stalking others, and other sorts of criminal activities. Hence the beep.

To reduce the beeping, you can share an AirTag with others: Share an AirTag or other item in Find My on iPhone - Apple Support

If you want a tracker for potentially-stolen stuff, check with a carrier for cellular GP tracker options.

Sabre170 wrote:

From the share airtag link you sent, it says "Tap Items, tap the name of the AirTag or item you want to share, then tap Add Person below Share This AirTag (or Share This Item)."

I don't have an option for add person

To confirm, do you have two-factor authentication enabled, and have met the other listed requirements?

Ok, something that is being seriously missed in this thread is that, even if you resolve the issue about the tag beeping, it does not resolve the issue that a car thief, who happens to have either an iPhone or Android phone, will get a notification that an AirTag is "following" them.

They can then use an app on their phone to help them locate the tag and disable it.

The bottom line? If you want to help recover your car if it is stolen, you need to get a dedicated GPS tracker, like the LoJack, for this purpose. The AirTag is NOT designed as a substitute for this.