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			My 96 C280 w/143k miles got a CEL and a P0400 code.  I replaced the EGR tube & EGR valve (following some advice and posts from others on this site) then cleared the code. 
		
		
		
			
		
		
		
		
		
		
		
	
	After about 10 miles the CEL came back on w/a P0400 and P0411 this time. What am I missing here? What's next to test? Replace? Any likely culprits? ANY help would be greatly appreciated. Thanks! Matt  | 
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