Car will not start when all instrumental lights are on without the key in the ignition. It will eventually turn off as it normally does when you pull out the key. Did also notice on the far right Lancer gauge, a green car light with a key. When it shuts off I can start the car normally. Horn did honk by itself once too. Fricken weird too. Car seems fine now but afraid it will happen again. Happened after I changed my O2 sensor (Bank1). Anyone have any ideas or similar systems? Any advise will be greatly appreciated.