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Disconnecting the battery on OBD-II systems does not clear the codes. Some DIY'ers have success with simply replacing the AMM and then the CE light goes out.
However, the codes are still stored in memory, and other than reading the adaptation values after replacing the AMM, you won't know if all the problems are solved. My C230 has a light hesitation under full load, and my mechanic and I are suspecting that the AMM is going south. This is the process we're going to follow...
1. Check for stored codes and read adaptation values. This will give an excellent starting point.
2. If engine adapatation values are "high" (but I have no CE light, so they have not reached the threshold) then we'll swap in a new AMM and reset the adaptation. After driving, re-read values.
3. If the AMM is not the culprit, then we'll begin with other stuff, basically fuel and spark. But, the nice thing about OBD-II is that it can give you a head start on running problems.
How do you know it's the Air Mass Meter? Is this a diagnosis, or are you shooting in the dark at solving your CE light?
PHAEDRUS242:
Why would a car suffer shift problems after an AMM replacement? Interesting.
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