check engine light came on 5/10/12. What could be wrong? on 2002 Toyota Highlander

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Veh has 37000 miles. driven locally 2-3 days per wk. Last oil change at dealer, 36756 miles, 24 jan 2012. Dealer said I needed power steering flush for 117.95, did not get. Last few weeks i hear a sound sometimes when i turn steering wheel. Could the check engine light be related to power steering sound? Car drives fine no stifnes in steering Or any other problem. I hear steering sound maybe once every 4 or 5 times i drive but only once or twice then it goes away.
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