So I was trying to help my dad a month ago on his car and I removed the screws from the front bumper because we were going to remove the bumper. We didn't remove it and I put the screws back in but the airbag sensor has been going on and off ever since. How do I fix it?? It goes on and off randomly.

 

You will first need to get the srs codes scanned to determine what the issue is. There should be a stored code present even if the lamp is not on (active code).

Some auto parts stores are able to pull the srs/airbag codes. A number of hand held scanners you can buy are also able to read srs codes but srs diagnostics are not found on the basic/entry level/cheap odb scanners.