a green light on the dashboard with the letter S

Narveen Aryaputri you might want to consider adding a picture of that light with your Question. That way we can see what you see and hopefully identify it right Adding images to an existing question

Going by your description, this sounds like the informational light indicating that your Discovery is now in "Sports Mode". You can turn it off by pressing the "Mode button" on your PRNDL.

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1999-2004 Land Rover Discovery

a green light on the dashboard with the letter S

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