the car crank but dont start. I change the crank sensor but dont have change

Hello, a "crank no start" condition indicates there is either a lack of fuel, spark or air at the engine, preventing the starting of the engine. Changing parts without any data indicating that the part needs to be replaced is a costly and unsubstantiated action. Perform a test to determine which one of the elements needed to start the vehicle are missing -- spark, fuel or air...or see a local repair shop near you that can help you. Here are some shops - click this link: http://repairpal.com/nissan-within-10-miles-of-rio-grande-puerto-rico-00745