Make sure there is no condensation or sitting water in the headlight unit. It is sometimes hard to see it since the car has sealed beams. Any water getting into the headlight connection would pop the bulb.
If you haven't done check the fuse box under left side of dash
Kia Optima was created in 2000.
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The 2006 Kia Optima has 16 valves.
The 2010 Kia Optima has 16 valves.
The 2004 Kia Optima has 16 valves.
The 2011 Kia Optima has a timing chain.
The 2003 Kia Optima has 16 valves.
The 2007 Kia Optima has 16 valves.
The 2005 Kia Optima has 16 valves.