Resetting adaptations can be a benefit or it can be a bust.

If your car has been running with a positive fuel correction and you readapt you will at first remove the extra needed fuel. If this is noticable you probably are real close to needing an air mass meter. Whatever the aftermarket piece is that you installed it will have much less impact on performance than a proper working AMM.

The other possibility is that you have altered the throttle position adaptation and you are now not getting full throttle response.

Both adaptations will probably relearn shortly. The fule adaptation will be relearned in 20 miles unless you just happen to drive it wrong. It will happen soon in any case.

I'm not sure about the throttle. I would try this: turn the ignition on and let the car sit without the engine running for a minute (it only takes 30 secs with a tool but give it time), then shut off the key and wait atleast 10 seconds and try it.

Disconnecting the battery also looses many other adaptations, windows, sunroof, D2B ring, steering angle sensor, clock, and others. Have you straightened out those problems?

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician