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Q:

about car on 2001 Chrysler LHS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
what causes the engine light to come on?
(1) Answer
It means that there is a fault code in your computer controlled emission system. There are hundreds of codes and you need to have someone use a scan tool to retrieve it. It is better to have a real tech do it than a 'free' 'diagnosis' from a parts store, because most of the parts guys are not really trained in diagnosis. A code does not mean just a part is bad, there is often more to it than that.