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Q: fuel gauge not right. how to fix on 1999 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
reads 16 or 17 gallons all the time. when it gets low, the low light does come on. how to fix.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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This happened on my 99 deville and my mechanic simply reset the computer by pushing a couple of buttons on the dash around the heater controls. I am not an expert, but if you can find which buttons to hit it is an easy fix.
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