If your car has a USB port that's become loose, there are a few things you can do to try to fix it. First, check the port for any debris or dirt that may be preventing a good connection. If you find anything, use a soft cloth to clean it out. Next, take a look at the connecting wires to see if they're damaged in any way. If they are, you'll need to cut and splice them together with new wire. Finally, try reconnecting the USB port to see if it's now working properly.