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Here are the instructions for aiming the headlights. The easiest thing to do is park about 10 feet from a wall (your garage door work nice) and turn the headlights on and then aim as described here:
Some models of the optima have an "auto headlight leveling module". If yours has this device it might be a good idea to take it in to a dealer. The auto leveling device can't be serviced or adjusted without a Kia Scan tool.
If yours has the auto leveler you will still be able to aim the headlights from left to right as described, but up and down will be difficult.
I wanted to see if you need any more help with this one.
Please let me know if you do.
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