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Don't pay any labour to install that Air Mass Meter. As you have seen installing your plugs, changing the AMM is a snap. Many dealers charge $80-$200 for a five minute job. What is the part cost? I think the AMM for the ME 2.1 M111 is about $600. Is the "service" the rest of that? Yikes!
Most of the jobs in the 72K service you can do yourself in about an hour, excluding "inspections." You should change the oil and filter, cabin dust filter, engine air filter, and possibly the fuel filter depending on if it's been done before. Check the book. Most dealer's "pad" the service to include stuff that is not in the book, and most is useless stuff anyway. On my 1998 car, the "B" service is about $700, and it includes little in the way of filters or fluids. It's hours of stuff like making sure the lights and horn work. The basic A service is $200+ and that only includes an oil change and a cabin dust filter. Way too high for me! I can do those jobs at home in about 15 minutes with $70 in parts.
Get your service booklet out. Your 1997 does not use the FSS, so I'm not familiar with the schedule. I bet 99% of the jobs you can do yourself without any difficulty. You could figure out the specific jobs you don't wish to do, and have the dealer do those. As an example, I don't like changing the coolant. My dealer has a flat rate of $40 to change the coolant (for labour) so I have them do it. Most other things I do myself, and with a very basic set of hand tools, it's possible. One of the GREAT things about owning an M111 equipped W202 car is the ability to do your own service work.
BTW, the adaptation value at max pretty much indicates the AMM is shot.
(As Steve Brotherton has kindly pointed out, our cars are not actually equipped with a Mass Airflow Sensor, but an Air Mass Meter, which technically, is different.)
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