I have a 2001 Tundra. It has less than 46,000 miles. I try to take care of it and always get it serviced at the dealer. My second battery (a dealer Truestart battery) died last week. It was about 4 1/2 years old. It was cranking fine one day and after about five days of no driving and some really low temperatures, it cranked over a few times and died. For about the last week and a half, I have been jumping it off whenever I drive with my portable jumper. I got a new Gold-Duralast battery at Autozone yesterday. They installed it and I got new terminals and felt washers put in because of corrosion. Later that day I was driving and noticed the Check Engine Light on. I don't think it was on after I first cranked it up with the new battery, but I can't be for sure. All I know is that it was on later that day and comes on now whenever I start it up. Is there a reset I don't know about? I was going to have my alternator checked tomorrow, but I haven't noticed any problems that would indicate a bad alterator. The battery indicator on the dash shows good current and hasn't fluctuated. Anyone have any ideas? Thanks.