One problem related to turn signal switch has been reported for the 2007 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Hyundai Sonata based on all problems reported for the 2007 Sonata.
Noticed lower brake lights were not working but the center brake light in the window works properly. Checked all fuses and they are fine. Replaced fuses anyways and still no resolution. Replaced brake light switch under dash by brake pedal and still did not correct problem. I think there is a relay that may be bad, but have received no explanation from several automotive experts. All of the brake light bulbs (4 of them) are fine and it would be surprising if all 4 went bad at the same time. All other lights operate properly including taillights, turn signals and reverse lights.