Cam shaft sensor replacement 2007 KIA Sorento 3.8L V6

The codes said the MAF and the cam sensors needed to be replaced. I replaced the MAF sensor, changed the oil & filter, the air filter under the hood and the check engine light turned off. I drove for a day now the light is back on. So I can assume the cam sensors need to be replaced still. I looked all over online and bought a chiltons manual (never again) and I can't find where the sensors are located no youtube , no images on google and of course the manual is useless in this situation. So where are they located, and will I have to remove a lot to get to them? Thanks