We've had over 50 people have premature failures (less than 30 days) with Bosch O2'*. We've also had similar instances of premature Bosch Plug and plug wire failures.
I've been there myself. My new Bosch O2 never achieved (or gained back) all my mileage. It puked 30 days later, and I replaced it with an AC Delco. There are COUNTLESS posts just like this on this forum.
Anyone considering the Bosch O2 sensor should be willing to take the risk, and be prepared to change it out prematurely. There'* just something about our 3800'* that they don't like.
One classic example was a member here (I'm not mentioning his name). His Father was an Engineer for Bosch, and he defended these O2 sensors to the end on his Father'* behalf. Until he discovered that they are INDEED crappola. He posted a retraction to his defense of them.