My car, after not being driven for awhile has had problems holding battery charge. I've replaced the battery and now it doesn't have any juice after being jumped, driven to a location and shut off.

I am dropped the car off to a dealer tomorrow (thank god I have warranty till the end of the month). I mentioned the reflash recall (the dreaded check engine light code p0300-or whatever), but they said it's only for 2004+cars (mine's a 2003).

Is he bs'ing? Is there anything else I need to know?