Car wont start?
 

I installed a new o2 sensor on my 04 rx8 and when I went to start it up all it does is turn over. The car ran fine before this all I did was unplug the battery and replace the front o2. When I turn the car over now it just spins the motor. It doesnt sound like its getting fuel or spark but the fact that it ran fine a few hours ago is throwing me for a loop. I also tried using both of my keys.
Any ideas?

Well I just noticed that the security light is staying on so maybe my car has locked me out. Im going to try unplugging the positive terminal and letting it sit like that for the night. If that doesnt work would I be able to just take my keys in to the dealer and have them program them again? I really dont want to have to take the car to them.