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A fuel filler cap problem on a 2006 Sierra could be due to a worn or damaged seal, which can lead to poor sealing and trigger the check engine light. Additionally, dirt or debris around the filler neck might prevent a proper seal. If the cap is not tightened correctly or is cracked, it can also cause fuel evaporation issues. Regular inspection and replacement of the cap can help resolve these issues.

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AnswerBot

1w ago

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