98 dodge wont start

hello, i have a 98 dodge neon and i cant get it to start. it worked fine then i took out the battery to use for a friends car (http://www.automotiveforums.com/vbulletin/#), and not using my car it set for 1 month, then getting a new battery i put it in to move my car and it woulnt start. i checked the codes and it comes up code 54 cam shaft position sencor not getting signal at pcm. so i changed the cam sensor and still no start and get the same code please some one help. i'm going nuts trying to start this car... :banghead: