EGR valve...engine code p0442

used an obII sensor to figure out what was up with my light comin on...read egr valve, small leak. doesn't sound to expensive...any one know what this part does?

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See <http://www.obd-codes.com/trouble_codes/generic/p0442-evaporative-emissio n-control-system-leak-detected-small.php>
<http://www.obd-codes.com/trouble_codes/index.php
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Alan
news2006 amac f2s com
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