You should try leaving your key in pos 2 (lights on but engine not
running) and let it sit for 1 minute. This should relearn the throttle valve stop. As far as the ASR light, try turning the steering wheel lock to lock if your car has ESP.
Otherwise, something went bad while you were swapping batteries. Did you hook it up wrong momentarilary or was the car
jumped? This could be very important.
DR.D