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I’m at my wits end with this issue. I have replaced the secondary air pump (2X), the relay and fuse. I also replaced one vacuum hose. I cleared all codes, but the CEL continues to come on. The car idles and runs like new. Fuel consumption is not a factor. Any help is greatly appreciated.
 

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1997 SL500 Sport pano triple black 2010 R350 - sold 2014 E350 - sold
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Welcome! Our sister forum may have more people with experience in this P0411 for your series MB. Check over here: W204 C-Class
 
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