How To Read Codes From Your Check Engine Light
The first step is to find your vehicles diagnostic plug. The one in my car was a small blue plug that was bundled together with another factory plug beneath my glove box on the passenger's side of the car.
Just stick your head up under the dashboard on the passenger side and look around for a plug that isn't connected to anything.
Pull the diagnostic plug out from the plastic housing that is bundling it to the other set of wires under there (I think the second set of wires down there are sensors for the ABS brakes or the airbags).