Two problems related to battery have been reported for the 2002 Ford Taurus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Ford Taurus based on all problems reported for the 2002 Taurus.
I bought a 2002 Ford Taurus sport edition used in July of 2005. Several times the dome lights and puddle lights would not turn off because the car thought that a door was open. There were no doors open. The car is designed to turn the lights off after 20 minutes, but this is a problem. If it happens often enough it could run down my battery. This is the 3rd time it has happened and this time I started the car and drove around for a minute and the dome lights finally went off while I was driving. However the door ajar warning was still on. So I got home and turned the car off and got out and then the dome and puddle lights do not come on now at all. The only way to get them to come on is to unlock the doors using the keyless remote. I am almost positive that the passenger side door is causing the problem, and oddly enough now the passenger side window wont work either and this has also happened before. This is a defect and should be fixed or at least diagnosed by Ford at no charge. I'm only 16 and don't have the money to fix this. Electrical problems can be very pricey and after I pay my car payment and insurance (mind you im 16 so my insurance is high) I hardly have enough money for gas let alone an electrical problem.
August 6, 2004 while driving at 65 mph the vehicle (30,750 miles) experienced a complete loss of electrical power. This included the four-way flashers. Towed to dealer who diagnosed the cause as a weak battery which was replaced.