Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
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Repairpal verified 2007 Buick Rendezvous problems
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.
The high pressure power steering hose will commonly leak fluid and should be replaced if this is the case.