I guess they forgot to tell these guys on Benz world they need to take it to the dealer..
I think you've just been hosed myself...

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I bough original Bosh MAF on ebay for $150. That was with no pipe, what cost me additional 2 minutes to cut slots on tamper-proof screws.
Nice pictorial, but I have mixed feelings.
Is somebody needs pictorial to release 2 spring-clamps and one screw, maybe he should take it to a mechanic?
BTW the CEL clears itself after few restarts.

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I just installed one on my E last week or two weeks ago. I purchased a used one from Potomac Auto ($135, I believe) just to make sure I knew what to do. I pulled the old one out and plan to clean it. The I found out later (like onesixthree pointed out), that one can get just the insert. My advice is to get the insert from Bosch, put it in and you'll be good to go.

The CEL didn't just disappear - it's a sampling sensor. Just give it time - mine selfadjusted after three/four days of driving.