I have a 2003 saab 9-3 arc, and i tried to start my car but the car was unresponsive and the key was stuck. i tapped on my battery and there were some minor sparks coming from the negative side and the car lights came back on. but when i tried to start the car again the lights and everything shut off and i had to start over again. but i did notice an error message saying immobilizer failure contact saab dealer. any clues as to wtf this is and whats causing this to occur?