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When does the beeping noise occur?
What does the green light look like?
I would suspect an aftermarket security system or anti theft device, Its possible you have one of these installed and the internal battery is dying in it and it is starting to cause the beeping noise. I do not think there is supposed to be any green indicator light under the fuel gage, may.e this is part of the after market system? Could you send a picture of the light so I can verify whether its a aftermarket light?
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