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Q: Little wrench light on dashboard on 2008 Mercury Sable

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The light has come on two different times - both when driving up steep hills in hot weather. The light has since gone off and there doesn't seem to be any problem. Do I have a problem or not and how big is it?
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