Quote Originally Posted by green91
your fuel pressure won't set the cat code, this code is set entirely on the length of time your converter is able to store oxygen, which compares the signals of your b1s1 and b1s2 oxygen sensors. however, running incorrect type and fuel pressures will make your EGTs out of an acceptable range and will damage your cat converter much faster than a normally functioning engine. most cats only have a 80-120k life expectancy.
damn mine is at 180k miles. but as i have read the cat does not gradually go bad it just goes. it ran lean until i found out what the mechanic did and i know that will mess up a cat, and it does it randomly where if the cat was gone it would be a constant thing correct.