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Fuel gauge inaccurate reading

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My Lexus IS 300, 2008 model sometime show me the fuel gauge reading quiet inaccurate and then next day becomes normal as if nothing have happened. What is the issue I am looking here for big problem or small problem. Thanks for any help here.

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To be honest, wait until it fails completely as after many lesson learned with the maintenance done based on educated guess cost 10 times more than actually required in most of the case.

Im sure real season car fixer owner can confirm my theory. It may be sensor of some fuse or wire causing this, but unless it's failed 100% it's very hard to get caught. My two cents.

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