Two problems related to battery have been reported for the 2002 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Hyundai Sonata based on all problems reported for the 2002 Sonata.
All three rear brakes lights on when ignition is shut off and smell electrical wire burn. Every day need to remove negative terminal from battery to shut off the three rear brakes lights.
Electrical system. I have already filed one complaint on the check engine light and the sensors. It has been in the dealership 9 times prior to this one. Now it is a cam sensor and I believe a speed sensor. Not only that but both wheel bearings are bad. It has roughly 78,000 miles. You can only get parts at a dealership. The parts are not only overpriced, but the dealership charges outrageous prices to do anything. You can unhook the battery and the light will stay off for a couple of months and then it comes back on. I take it to the dealership and they supposedly fix it and the light comes back on in a shorter amount of time than unhooking the battery. I have spoke with Hyundai when the problems started and all you get is we'll fix it until the warranty is up then you are out of luck. I can't keep the check engine light off long enough to even sell it.