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Carlos:
You can put the MAF sensor in yourself. if the "check engine " light is on, it may or may not go out eventually on it's own. Lately. I have not been "calibrating" or resetting the adaptation for the fuel mixture, I've been leaving it alone, for a couple different reasons I won't go into here, unless prodded.
Some posters here have been saying the "check engine" light does go out by itself; I was taught otherwise, but if some say it does, i won't argue. When you work in a shop and can clear the code, it doesn't really turn into a problem.
I've had alot of bad range recognition switches, especially the first few years of ML production, haven't done one in quite awhile now, surprised they didn't remember this at the place you went.
If I recall correctly MB on warranty paid about 2 to 2.5 hours or so to do the job, incl R&R center console and remove the shifter, then tear the shifter down and replace the switch.
Gilly
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