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How much should it cost to replace the sensors on my transmission?

(2002 Kia Spectra)
in Nashville, TN on August 15, 2014
My check engine lights keeps turning on and then off every couple months. They said that it could be a bad sensor, the one that measure temperature for the transmission. They told me that I had to replace all of them, because they sold them in a set and that it would cost me about 400. Is that right? and do I really have to replace all of them. What would happen if I didn't. I don't know much about cars at all and need some help!!!
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