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Q:

fuel gauge not working on 2005 Buick Terraza

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
fuel gauge on empty-check engine lite on - low fuel message - fuel tank is full
(2) Answers
could either be the sender unit in the tank or the dash unit. a scan tool will confirm the dash unit.
you will need a shop to do that test.

Roy
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if we scanned the car i could tell u for sure but sounds like a fuel level sensor u can call us at 330-333-3997 thanks