I replaced both camshaft sensors after getting stuck on the road with camshaft code.

Should I replace the crankshaft sensor to prevent getting stuck on the road again? not sure if they are notorious for going bad as the camshaft sensors.

Is there more than one crankshaft sensor?

 

Just one, and I've only replaced one cam sensor but keep the other one in the trunk. If your G and you are never far from a parts store there is no reason to replace this part prematurely.