Crank and Cam Position Sensor Locations

I think I have a crank sensor issue, but don't know if it is crank or cam sensor giving me the problem. The one I found is in front lower engine, on passenger side of engine. Had problem crank but no start. Went on line and determined to be sensor. Wiggled connector and car started. Don't know if bad or connection was loose or moisture got in. Have had no further issue but afraid to drive because don't know if car will just stop if in fact sensor is bad and goes out completely. Please help with location and if should be replaced or could have been just loose connection.
Thanks for your help,
Ron Ramsey