You know wut.i rechecked the wiring for the fuel injectors.and they r fyne.and there seems to be no codes being thrown at the ecu. As for the rotten egg exhaust smell.i figured it was running to rich.and changed to o2 again........it seems to be fine now.i still dont know wut could be causing my car to throw a code 20.could it be the alternator is no good?