Two problems related to wiring have been reported for the 2003 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Hyundai Sonata based on all problems reported for the 2003 Sonata.
The air bag light is constantly on, meaning that in the event of an accident, they will not deploy. Incredibly dangerous. This is apparently due to wiring underneath the passenger seat stretching and pinching from moving the seat itself and when things are placed underneath the seat that may disturb the wiring. I know it is the wiring underneath the passenger seat due to checking the trouble code and also being able to temporarily fix the issue for a couple weeks by gingerly moving the wires until the light went away. Now I can't get the light to go away no matter what methods I try. Can't find a replacement set of wires nor can I locate which wire specifically is being affected to try to fix the issue myself. I have seen dozens of people making this same complaint about the airbag light staying on. This needs a recall since this can easily lead to death since the airbag will not deploy to attempt saving methods to passengers. Light was on for the previous owner for I don't know how long and has been on for me for almost a year now.
I have had multiple wiring problems, and four separate occasions needed to be towed to dealer two of which car died while idling and waiting for green lights.