This forum has saved me over a thousand dollars.
No, really, it will take you more time to locate the mass air meter than it will to replace it.
Once you locate its position in the black tube, use a screwdrive to loosen the clamp, pull apart the tube, take out the old one, insert the new one, push the hose back together, and tighten it up.
10 minutes at the most.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".