With some cars you can do things to get fault codes without having to have any special tools or computers. Some cars don't have this feature. I thought my 89 GT allowed this, but am not sure, and I know my plymouth does, but it would be a different method for a ford. I just need to know if I can do it, and if so how. In the plymouth I turn the key to on, then off then on then off then on, and the check engine light blinks out the codes, and when it's done it blinks 5 times, pauses and then 5 more times, then shuts off.