2002 Kia Optima

Transmission problem
2002 Kia Optima 4 cyl Two Wheel Drive Automatic 93000 miles

My transmission shifts incorrectly. I just took it in to get smogged and they told if failed because of code PO715 and PO720. Is there anything you can tell me about these codes. They told me to take it in and have a machanic check the turbine speed sensor circuit malfunction. Do you think I would have to order the part from the dealership?
April 11, 2008.

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