One problem related to o2 sensor has been reported for the 2003 Kia Motor Optima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Kia Motor Optima based on all problems reported for the 2003 Optima.
The engine and air bag light would come on and off. The engine oxygen sensors were replaced. The air bag assembly needed to be replaced. There were several other problems. The consumer was informed that he gas cap was the problem. Reference to recall#04v180000. The door on the driver side continued to lock without pressing.