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I am trying To find where the EGR Valve is located so i can check it, and replace it if it needs To be replaced.

Vehicle: 2007 Chevy silverado 2500HD 6.6 diesel

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see picture below 

carbon built is the most common cause of the egr not working correctly 

you can try to clean it with wd40, brush and screw driver, then clean it all off with brake cleaner. 

Chevy silverado 2500HD 6.6 diesel EGR location

Chevy silverado 2500HD 6.6 diesel EGR location

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