1997 Concorde error codes

I get a po306 and a po154 code when I run a diagnostic, I took the card to an Autozone and it read O2 sensor bank2 sensor1 not responding. The folks at the autozone had no idea what that meant and neither did the Chrysler service manager at the local dealership. I replaced the O2 sensor on the passenger side but I think that may be the bank1 side because it has the #1 piston on it. The check engine light stayed off for a few weeks and then BINGO back again. I took the old O2 sensor apart and found that the tip is made from a porcelin-like material with a coating over it and hollow inside. The part that I bought was a bosch so it should be the best but now I think I may have more bad sensors. Anyone run accross this problem and correct it quickly?