Upvote:3
Login to your Trusted Traveler account
From the TTP Dashboard you can scroll down slightly, and under Program Memberships you should see Add Vehicle
From the TTP Dashboard, on the right-hand-side you will see "Manage Vehicles"
In the Manage Vehicles dialog you will have the option to "Delete Vehicle"
I didn't click on the Delete Vehicle, but I suspect it'll ask you to confirm, and you should be all set. My understanding is that it can take some time (anywhere from a few hours to several weeks, or even months) before the vehicle actually comes active on your account. Until the new vehicle is active/approved, you CANNOT use it through SENTRI. Doing so can put your SENTRI membership at risk!