O2 sensor problem on 2001 Infiniti I30

I have had the same o2 sensor changed three times. It keeps saying sensor 1 bank 1. I just had it changed two weeks ago and the CEL is back on. It is now sayng "too lean". What can I do?

Asked by for the 2001 Infiniti I30
I would check for vacuum leaks, this will cause a "lean" condition and set the codes that you are getting. You can learn more about this here:
Have all of these sensors been replaced at the same repair shop?