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my engine light stays on on 2007 Dodge Charger

my engine light stays on; and can you tell which one is the engine light; and one valve make a little noise while idling

Asked by for the 2007 Dodge Charger
If the check engine light is on, there will be some diagnostic information stored in the engine control module. This information needs to be retrieved by a mechanic and the problem diagnosed to determine what is wrong.