THE BEST WAY and free way isgo to a Pepboys or Napa or Autozone place, ask them if you can borrow their scanner, you have to leave a credit card or your license with them just so they know your not going to steal the scanner, then plug it into the computer of your car,its under the steering wheel kinda, look under there you will see the connection that matches the wire on the scanner, plug it read whats wrong it will give you code, you can write it down, and then it will ask you if you want to erase the checkenginge light, press yes or ok, and if its a minor problem it will go away, if its a big problem it will tell you what it is.hope that helps