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Your question is a little cryptic but assuming you're asking why the Check Engine light has come on there can be hundreds of reasons. Most often it means one or more sensors have found something wrong with the emissions system. That can range from a loose gas cap to a bad spark plug or a clogged catalytic converter.
Fortunately finding the culprit is fairly simple. Take the car to any auto supply store that will lend you an OBD II diagnostic computer. It's a handheld gizmo you plug into the OBD II port under your dash (usually to the right of the steering wheel). That'll give you the trouble code or exact cause. You can go from there buying replacement parts if it's something simple or letting your favorite mechanic do the work for you if the fix is more involved.
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∙ 12y ago
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