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I have Bosch and have had good look with them over the years, though a few people have had problems with them. Just get a name brand at you local auto parts store and you will be fine.
I'm having issues with my O2's as well. I replaced the faulty on about 1000 miles ago with a bosch unit and now I'm having the same issues as before. The new O2 has crapped out in only 1000 miles if that. I just ordered a Denso O2 that will be here friday and hopefully end my O2 problems. I wouldn't recommend bosch as an alternative.
I'm having issues with my O2's as well. I replaced the faulty on about 1000 miles ago with a bosch unit and now I'm having the same issues as before. The new O2 has crapped out in only 1000 miles if that. I just ordered a Denso O2 that will be here friday and hopefully end my O2 problems. I wouldn't recommend bosch as an alternative.