Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
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Newest reported 2004 Saturn Ion problems
The power steering assist may be lost intermittently along with illumination of the "power steering" warning message. In most cases, the power steering system will return to normal when the ignition is cycled off and the engine is restarted. General Motors recommends to replace the electric power steering assist motor to correct this problem. They have extended the warranty on the power steering assist motor to 10 years or 100,000 miles on most 2004-2007 Ion models. This is not a "recall" but an extension of the original warranty.