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Hello All, I am new to this site and I’m hoping for some help! I have searched all over the internet and have had no luck. So I have a 99 Buick century custom throwing code P0401 so I go for the egr valve took it off and there is a tan/brown sludge type of stuff in there. Any ideas on what’s causing this or what the solution is to fix? Looked everywhere and can’t find any concrete information. Thank you for any help you may be able to provide.