My car has trouble starting.?

Brandon I know the oxygen sensors would help with your vehicles performance but I do not think that is what is making it hard to start. I don't know what kind of car you have but it could be your plugs, fuel filter, coolant temperature sensor, fuel pump, or any number of things. I don't mean to scare you but vehicle make could give us more information. My car was hard to start and it run terrible for a few minutes and it was the coolant temperature sensor that went bad and did not show a code. The computer ignores the sensors signals if they are not working and puts the system into a closed loop. They don't do anything until they are at 600 degrees anyway. So obviously they do not affect start up.