Tracking devices look different depending on their manufacturer and their purpose but some general guidelines can help you locate one on your vehicle. It will typically look like a small box with a magnetic side. There may or may not be an antenna or a light on it. It will be small, usually three to four inches long, two inches wide and an inch or so thick.
You want to check all the locations where a tracker could be hidden. A tracking device placed on the exterior of your vehicle needs to be weatherproof and compact.
Check the wheel wells. Using a flashlight, look in both front and both rear wheel wells. Use your hand to check in areas that aren’t easily visible
Look at the undercarriage. Use a magnet on an extendable pole to look far underneath your vehicle
Look behind your bumpers. Inspect under the hood. Lift your hood and look for a tracking device stuck to the strut towers, the firewall, behind the radiator, or hidden among the battery, air ducts, or other components
Or you can use an Electronic Sweeper. An electronic sweeper checks for the presence of a radio frequency transmission or a cellular signal transmission and indicates its existence to the electronic sweeper’s user.