to know the code and what problem do you have on your car? i've see a lot of people that say, i have problem with code21 or so .. so, what do you use ?

 

or you "read" the CEL?

 

paper clip

 

read the faq

 

there should be a jumper under the dash on the passengers side just to the right of the footwell, stick a paper clip in the plug and turn the igniion to "on" then either the CEL should blink or the led on the ecu but it depends if u have obd0 or obd1.