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The check engine light is generally to alert you to some condition that is causing the emission control system to malfunction. This could be as simple as a gas cap that is not sealed properly to a fuel injection problem, i.e. to rich .

If the car runs normally with no noise, then try removing & replacing the gas cap correctly. The light should go out in a few minutes. If it doesn't and the engine runs normally, take the car to a service shop when it is convenient. Pepboys, Kragen and Autozone will check it for free.

If the engine runs rough, then slow down & drive carefully to avoid stressing the engine (i.e. no hard acceleration) and get it to a service shop as soon as possible - do not keep driving it, permanent expensive engine damage may result.

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Q: What causes a check engine light on a 1999 Chrysler Concorde?
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