OBDII Live scan results & bad a/f (pre cat) sensor

Finally got an OBD2 tool & am trying to learn what the feedback means as far as my next steps in troubleshooting said engine.
So far I see my timing is off, the bank 1 sensor 2 is all over the place while idling, stuck in a closed loop, etc.
I’m sure there’s much more to interpreting the info than jumping in & changing out parts because of the live results.
Which brings me to my question. I pulled the a/f bank 1 sensor 1 (before cat). I was kicking myself for not doing this when I manually cleaned the carbon out of the valves/intake/etc. Anyway, I thought it would be covered in black. It was not. Did a resistance test & it was .02 at room temp. “03 manual has it at .8-1.4 at 68 degrees. So it looks like one piece of my puzzle may be solved.
Question you say? Would this or anything else affect a timing live data reading? I get that I can manually go in & check the timing. That is of course a bigger job & if there are other possible reasons for this scan result, it’d make sense to look at those.