Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
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RE: Mass Air Flow Sensor? (What is it??)
Welcome to the forum.
FYI, the MAF is always located in the intake stream between the manifold and the air filter. I attached a picture of the one common to the C220. Armed with the pic and knowing where to look you shouldn't have any trouble locating it.
They are pricey little dogs on any vehicle, but look on line for the best pricing if you're going to change it. Personally I've had great luck with www.autohausaz.com and autopartswarehouse.com, both offer free shipping once you hit $50.
You didn't mention miles but hard shifts can suggest a fluid change is in order. It's supposed to be a "lifetime" fill, but most folks seem to change it out, some argue about every 30K, average seems to be around 60-80K. However, the other post is correct, if the MAF sensor is tossing off inaccurate readings, the computer's attempt to compensate can alter shift points, etc.
Good luck and enjoy the ride,