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It is the "check engine" light, indicating that the computer has seen something unusual or out of spec and stored a code. If the car is still operating normally, it may just be a service interval warning, or it may have discovered a one time issue, or the onset of something (such as a catalytic converter failing, or an oxygen sensor reaching the end of it's life). If the car appears to be driving normally, I'd simply take it to the dealer as soon as is convenient, but there should be no need to panic. If the car is running awfully and throwing a code, I'd have her take it to a nearby dealer right away and find out what it is before continuing much farther.
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