Have an 07 stock cobalt. Engine light stays on at all times, sometimes blinks when I'm driving. Traction control light comes on when you start the car. air bag light comes on around once every week. And when shifted up after being stopped at a stoplight it kicks when it shifts up onced, Changed spark plugs, all four coils, and one fuel injector. Someone said might be o2 sensor? does any one know anything about this?