The standard procedure is to read the trouble code that is being stored
and see if action needs to be taken.  It can be a defective gas cap and
it can be one of the computer sensors, which are necessary for proper
operation of the vehicle.  You should find some way of reading your
codes, with a garage that will do it for you or learning how to do it
yourself.  Some auto parts stores will do this.  Some garages will do
this.  All dealers will do this.