(same post as the other board)
Yup, I think every car has an OBD system of some type. There should be a connector under the dash by the drivers knees. Depending on the year of your car it depends on what type you have. 96 and newer uses OBD II. 94 and older uses OBD I. 95 uses an OBD I computer with an OBD II connection.
You can pick up a scan tool for most of these at your local auto parts store. If your car is old enough (93 and older?) you can actually jumper two connections in this connector and get the SES light to flash a code for you without using a scanner.
What year is your car? It all depends on that.