in front of the battery in the firewall is the little box, if you have the red led with little pushbutton, you can pull the codes with the key on by holding the button for 3 seconds, after you read it, you can clear it by holding it for 8 seconds after, you need to do this for each stored code, some models will require a pulse counter to read the codes, hopefully for you you have the led type, i think there is a thread somewhere that describes how to make one if needed.