How can I reset a Check engine soon light on a 06 BMWci w/manual gearbox?

What is your question?

I store my 06 325ci with 43K mi during the winter months. All service is up to date. This past winter the battery went completely dead for several weeks. This spring I replaced the battery. Other than that, nothing else was done to the vehicle. After replacing the battery, I drove the car and within 2 miles the Check Engine Now light came on. No other malfunction is noticeable. I believe the light came on only because the battery was dead for so long. How can I reset the light without taking it the dealership?

What makes this problem better or worse?

Not applicable

How long has your 2006 BMW 325Ci had this problem?

This is the first time