crwdns2934241:0crwdne2934241:0 ted

crwdns2934249:0crwdne2934249:0:

I have had same problem.     it is more of the line your catalytic converter is bad. I changed mine and am no longer getting a bank 1 sensor read on the computer.   for your second question there is 3 to 4 on the 626.  all in plain site if you look under car.  and on or near manifolds.

crwdns2915684:0crwdne2915684:0:

open