One problem related to o2 sensor has been reported for the 2005 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Hyundai Sonata based on all problems reported for the 2005 Sonata.
I have not owned my 2005 Hyundai Sonata for one year yet and is experiencing a confusing time with one set of the exterior lighting not working at all, the fuse were checked so I was told that it may be the switch, also the electrical system on the power doors always lock three out of the four doors. The check engine light goes on and off every other week the code says its a oxygen sensor. The lighting it restraining me form driving at night.