the TX test calls itself ASM version 0305.
Dilution is given in % at the bottom of the page and I do not know more except the test wants it to be >6%.
My cat has 320K miles on it. I checked O2 sensor has 320K miles also.

thus my O2 sensor must be ok if the CO is low-true? If so I will not change it at the next tech session.
Thanks.