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The check or service engine light comes on to tell you that the computer has sensed a problem with a component in the engine control or emission system. When the light comes on the computer stores a code related to the failed component. This code can be retrieved with a tool called a scanner, once the technician has the code he has a pretty good idea of what part or sensor has caused the problem. Even if the car is still running well, the system should be scanned to be sure that you are not causing damage to the motor or other related parts. Sometimes it is something as simple as a broken connection or leaking vacuum hose or loose gas cap. If you get the codes and post them here we can help you with repairs. Some auto parts stores like Auto Zone or Pep Boys will scan the system for free, in hopes of selling you the parts needed for repairs. Thanks Bob
Thank you for your quick reply. I will take the car to get it scanned. Hopefully it won't be anything major. We have had very little trouble with this car.