I need your help in figuring out this problem -

I was driving along and my engine just dies as I come to a stop sign. Starts right up (check engine light on) come home get the codes : 1-1-3 & 1-1-5
I did a search and turns out this isn't a very desirable code. Cleared codes and later the same day evrythings fine until light goes off again.
turns out : 2-1-2
This is intermitant as it happend after about an hour again. (2-1-2) The chiltons manual isn't very helpful with this kind of diagnostics. (O2 sensor?) Any one else had this happen ?

I found a few archives on the 1-1-3 / 1-1-5 seems to be bad harnes or something. How does this happen do the wires just fall apart?
I don't have diagnostic tools so I where do I begin.

I've had the car for almost 2 years with only a bad ac compresor. Has almost 200K but runs great otherwise.

Greatly apreciate any help
Thanks for your time

VHT