One problem related to car will not start has been reported for the 2004 Kia Motor Optima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Kia Motor Optima based on all problems reported for the 2004 Optima.
Purchased 2004 kia Optima ex new. Have had fuse block replaced w/in 15000 miles. Now, the fuel pump has failed. The car ran fine and was parked. Next day car would not start. No fuses blown. The terminal connector from the fuel pump to the gas tank penetration has burned out causing an intermittent open in circuit. Fuel pump burned up in tank. Wires and connectors visibly charred. Connection that failed is inside of the gas tank. Very similar to ntsb case #10161074. Have 120,000 miles on the car. Others with less mileage are in for trouble due to poor engineering design. Defective parts available for photograph or inspection.