my son was looking at buying a 1997 pickup (4cyl 4wd). the check engine light came on and auto zone said it was a code for the crank positioning sensor. where is it located and how hard is it to change. the truck has just had a transmission put in it (5 speed) if that means anything. the part is only 35 bucks. the truck seems to run and drive fine, just wondering about the sensor. thanks for the replies.