Assuming you don't have a spare key fob, there are still a few ways to start your Honda Civic if you've lost your key fob. If your car has push button start, you can use the emergency key to start the car. The emergency key is a metal key that's stored inside the fob. To use it, insert the emergency key into the ignition and turn it to the ON position. Then, press and hold the start button for two seconds. If your car doesn't have push button start, you'll need to tow it to a dealership or locksmith to have a new key made.