If your check engine light comes on, you should take it to a mechanic for a visual inspection right away. This light can turn on as a result of problems as minor as a distributor cap issue but can also be related to more significant problems. In fact, check engine lights can be a sign that engine repairs are needed and may even be a result of problems with the car's ignition systems or an internal combustion engine, so it is very important that you get your car checked out as soon as this light turns on to avoid long-term damage.