I started my car on Saturday and the engine misfired miserably. The service engine light displayed and I called the dealership service advisor. I was told to shutoff the vehicle and they would dispacthed out a tow truck. After shutting the vehicle down and quick restart to put back in the garage. The fault cleared and the engine ran with not faults. The dealer informed me today that my battery was weak and possibly needed replacement for a price of $400.00. Again the service advisor stated that the battery would need to be serialize to my car. I am not sure about the battery! Any suggestion and help would be appreciated.