Check engine light on...computer says EGR not flowing Is this an expensive repair?

2005 MERCEDES BENZ ML500
95,000 MILES
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EGR not flowing
Dec 13, 2011 at 8:04 PM
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RASMATAZ
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Try cleaning out the EGR Valve and Ports and see what happens
Dec 13, 2011 at 8:10 PM