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To the best of my knowledge, all of the 112 engines use the part number you quoted, so all the MB V6's use it.
On the modular V8 (113 engine, ie the E430 you mentioned) it actually looks like the same part, but you will notice the part number begins "113" instead of 112, not identical parts.
Yes, it sounds like you are describing the location accurately for a 112. On a 113 it's a little trickier.
We have had many mass airflow sensor problems, mostly on 112 engines. I don't believe the problem is isolated to MB, I believe other manufacturers are having troubles with these as well.
I don't believe trying to clean it will help, may make it worse in fact. But if it's not under warranty, it's yours to play with.....
Gilly
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