code 2

Ok I am really confused, My ECU is blinking 2 times and I have sat and watched it for along time. 2 blinks and then a couple of seconds of nothing 2 blinks etc. From what I have read there is no such thing as a code 2. I have looked everywhere and found nothing. What is this and how do I correct this problem. :banghead:

are they slow Flashes or quick flashes?
could be a code 20... electric load sensor