my neon has not been starting. At first I thought it was the fuel pump and went through checking my fueses. It turns out my fuel pump works but I still cant start my car. When I get the codes I get codes 12, 44, and 22 which dont make any sense to me. I have a list of the code and what they are so I know what the codes mean but I dont know what to do about them. My battery temp sensor is also missing. Would this cause my car to not start?

For the Code 22, pull the coolant temp sensor and make sure it's clean and free of any debris. It's possible it's not making a good connection. Also inspect the wiring and make sure its seated properly.

I don't think the batt sensor would keep it from starting, just keep the battery light on.