2004 Saturn Ion car won't start

check the mass airflow sensor located in the air filter box and check the engine coolant temperature sensor, it ma be faulty

Legitimate,

Turn off the pass lock and don't use it again. Pass lock is activated when you lock the car from a remote, and it's a security feature to prevent theft. The downside of this, is that a piece of silicon in the device can expand and contract with the weather conditions. I have had this happen to me in the winter; I go to turn it on, and it doesn't start. Well, pass lock thinks you are trying to steal the car, because this silicon sensor has contracted, and will disable the engine for 15 mins or so. The solution is to maunally lock your car using the driver's side manual switch. I have been doing this procedure for 2+yrs now and the problem has never come back. Good luck!