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Q: change oil sending unit on a 2003 envoy on 2003 GMC Envoy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the oil gauge goes from 80 to 0 back to 80 no engine noise like if there was low oil level and check engine turns on then a turn engine off warning then it all disappears.
My scanner does not read any codes?
I'm planning to change the oil sending unit and need to know where it is and how to do it.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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