Larry,

I had all those same codes when I was trying to hunt down the problem with my E420. I replace all those items that you got codes for including the ETA and still the M119 would not run. What does your hot wire on the air mass look like, is the wire intact and is all connected. My problem was the Ignition module, but you say yours is only two years old. What about you LH-SFI Module this module controls your air/fuel mixture. The LH module also harvest the chip. Another item that comes to mine is the Crank sensor on the flywheel. From what I have heard those sensor hardly never go bad.

http://pages.prodigy.net/jforgione/MB_SFI.html

Do you have the repair manual on cd so that you can get the wiring diagram? I will dig mine up and try to help you hunt down this problem. Keep us posted on your progress.