This Sun Pro kit, available from JC Whitney (13ZH6156R), has everything the OBD-I owner needs to recall engine codes and test out the sensor or component said code identifies.

Check out how to read OBD-II engine codes and learn what they all mean. Get all the details here in this month's issue of Turbo & High-Tech Performance.

These DTCs are numeric codes that are stored in the car's computer when a problem is detected. By analyzing DTCs, a car code reader can help to identify the cause of a car's problem.

Consumer Reports explains what the check engine light means and what to do when you see it: how to tell if your car has a loose gas cap—or a serious engine problem.