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Problems for specific Hummer H3 years:

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Repairpal verified 2007 Hummer H3 problems

 

Verified for the Hummer H3

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.

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Verified for the Hummer H3

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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