ok so yes, we did change the correct one
tried the injector cleaner and the maf cleaner
hmm did not work- THEN my son noted when he made a turn over a bump the warning went off then back on- so he said; electical 'short' or something.

today he spent hours tracing the entire electrical system for me-- and as of now we think that was the problem, drove and no O2 code, no codes pending----so yep maybe did not need that sensor in the first place with the first code, but we are not pro's and bottom line for me- I still think I saved much $$$ if I'd taken to dealer---in my experience who would have replaced just about everything including 'another' wiring harness

this forum is great, thank you all and the administrator, this is not the first time i've asked and gotten valuable advice.