1989 Buick Lesabre Fault Code 41

I recently did a check on my car cause the engine check light has been on for about a good 3 months.The code read 41,so i looked it up and it said something like "Cam sensor or cylinder fault=referance pusle system fault",what does all that mean? Also,the car runs great,stars up on a dime,no hesitation,on signs of a problem,I wuold like to know why or what may be the problem? The light doesn't flash on or off,it is constantly on,what cuold or should I do to get that light out of my face,it's very distracting,please advise.If you have pictures of what the problem is feel free to send them to me or email @ stoneyglenn@gmail.com.I need an answer so I can get that light off,also have tried everything as far as disconnecting the battery,check gas cap,checked fuses,so whatelse is there to do? Hope to hear from you SOON.