Every car sold in the United States since 1996 should have a port ready for the FIXD sensor to be plugged into. Once plugged in, you can leave the sensor there so that you receive the latest vehicle updates.
The FIXD sensor connects to your phone through bluetooth. If you leave bluetooth enabled on your phone, the sensor should pair everytime you enter your vehicle.
With notifications enabled, FIXD will notify you when detectable problems arise.