94 Civic EX: NYC emissions results / question

Posting these for comparison:

8/2/2005:
HC CO NOx
Limit: 0.50 15.00 2.00
Result: 0.23 8.44 0.46


~7/29/2004:
HC CO NOx
Limit: 0.80 15.00 2.00
Result: 0.23 3.41 0.73


As you can see, my CO is quite a bit higher this time around: what could
cause that/what does it mean? Any chance it has something to do with the
fact that my exhaust Pipe B was full of pinholes and the muffler was
coming apart last time around, and everything from the cat back is new
this time? And why is the NOx significantly lower?

don't know, but I took an emmision test today (in CT) and then realized
that I used TECHRON last time I filled up the tank, and I was wondering
if my emission is going to be screwd up, but I am glad I passed (Civic
LX 2001).

does anyone know if fuel injector cleaner affects the emission results
in any way?