92 olds 88 no spark

I am not familiar with this car at all and my friend asked me to help him. It is a 1992 Oldsmobile 88 with 126K miles and a 3800 engine. One day the car did not start. I checked the engine and found out there is no spark. After researching I have found that the crankshaft position sensor can sometimes be at fault. Could this be it, and can I check before trying to replace it? I do not know how to check any of the elec sys for the spark, so any ideas or solutions would be helpful.
Thank you, Eric